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[Illustration: CHAIN BRIDGE. See page 68.]

A

HISTORICAL ACCOUNT

OF

USEFUL INVENTIONS

AND

SCIENTIFIC DISCOVERIES:

BEING A MANUAL OF INSTRUCTION AND

ENTERTAINMENT.

BY GEORGE GRANT,

AUTHOR OF “PANORAMA OF SCIENCE,” “THE HISTORY OF LONDON,”

ETC. ETC.

LONDON:

PARTRIDGE AND OAKEY.

MDCCCLII.

PREFACE.

It has been demonstrated that the desire of obtaining knowledge is one

of the most natural, and, at the same time, most ennobling attributes

of the human mind. There is at the present time a great number of

inquiring minds among the working classes of this kingdom, and a still

greater number of the young of all classes thirsting for information,

who in entering upon a course of general reading must be greatly at

a loss for many things which are familiarly alluded to in ordinary

conversation, with which everybody is understood to be acquainted, or

would have people to think so, but which, in reality, are only familiar

to persons who have been living for a considerable time in intimate

converse with the world.

The “Historical Account of Useful Inventions and Discoveries in

Science,” is intended in some measure to supply such information to the

anxious inquirer after knowledge. Of the numerous articles here treated

of, it will be perceived that each has been traced to its origin in

as lucid a style as possible, and in so doing we have endeavoured to

combine instruction with amusement. As a proof of this we need only

refer to the table of Contents.

CONTENTS.

PAGE.

Printing 11

Stereotype 25

Engraving on Wood 27

” ” Copper 28

” ” Steel 30

Lithography 32

Paper 36

Paper Hanging 41

Painting 45

Statuary 48

Drawing 55

Architecture 62

Chain Bridges 68

Clocks 69

Watches 74

Water Clocks 77

Spinning 80

Stocking Manufacture 84

Coaches 95

Saddles, &c. 104

Horse-Shoes 107

Gunpowder 111

Guns 114

Astronomy 119

Navigation 155

Light-Houses 159

Electricity 167

Electric Telegraph 169

Steam-Engines 171

Mills 195

Saw-Mills 211

Forks 214

Music 219

Sealing-Wax, Seals, &. 228

Black Lead Pencils 234

Coloured Glass 236

Etching on Glass, and Glass-cutting 240

Hydrometers 246

USEFUL INVENTIONS.

PRINTING.

Among the many arts and sciences cultivated in society, some are

only adapted to supply our natural wants, or assist our infirmities;

some are mere instruments of luxury, calculated to flatter pride,

to gratify vanity, and to satisfy our desires of every description;

whilst others tend at once to secure, to accommodate, delight, and give

consequence to man. Of this latter kind, Printing undoubtedly stands

pre-eminent; and if viewed in its full extent, it may be truly said to

possess a very considerable portion not only of the comforts, but the

conveniences and positive utilities of life. The advantages derived

from this invention must be acknowledged by all,--this art has proved

the principal step towards civilization: by it has Christianity been

propagated; and by its powerful means are we made acquainted with all

that is useful in knowledge, in art, and science. It would take the pen

of an inspired writer to enumerate all the blessings which flow from

it. It is a patent engine which possesses a preponderating influence

over the mind of man either for good or evil, according as it is used.

As we proceed we will have frequent occasion to express our feelings

in grateful eulogium, when considering the benefits resulting to

society from various ingenious inventions and discoveries; but when

we consider the advantages derived from the typographic art, it

appears like a vortex, drawing every other sensation into its deep

interest, and engulphing every consideration, so that we can think of

nothing but printing, and its extensive catalogue of benefits. This

interest is wonderfully increased, whether it be viewed on account of

its ingenuity, the extent of its benefits, or the benevolence of its

objects. In whatever point of view we behold it, whether as a medium

for giving the utmost facility to the despatch of the common concerns

of life; or as affording the eager mind of the philosophic inquirer

the ready means to gratify the inquisitive thirst of his knowledge;

in every species of mental intelligence, the rapid facility which it

affords to the multiplication of those mediums of communication, by

which knowledge is promulgated in every part of the earth. We are at

a loss for a term sufficiently comprehensive to express our sense of

the infinite importance of those advantages which accrue to mankind

from the invention of an art so replete with important consequences,

which we hourly perceive to emanate from typography. We need therefore

scarcely offer an apology for inserting a brief history of this divine

art in our pages.

The earliest specimens of printing which have been discovered, consist

in the stamped marks on the bricks and tiles used in building the tower

and city of Babel, and which may be dated as far back as two thousand

two hundred years before Christ. A number of these stamped clay

materials of Babel are still preserved in antiquarian repositories. It

is remarkable that they generally differ in shape and appearance, and

that the letters or words, which are in ancient character, seem to have

been stamped by the hand with moveable blocks. In Trinity College,

Cambridge, some curious specimens are preserved, one of which is a

round piece of clay, seven inches in height, and three in thickness

at the end, resembling a barrel, being thickest at the middle. This

interesting relic, this Chaldean book, is entirely covered with lines

of letters and words running from the one end to the other; from its

portable character it may be called a _pocket volume_, and one which

cannot be less than four thousand years old. It is mounted on a marble

pedestal, covered with a glass case, secured by an iron bracket, and

so contrived that the curious inspector may cause it to revolve on its

marble base; but the greatest care is taken of this valuable relic of

antiquity. It appears to have been printed by two moulds, and at the

middle of the circumference a small blank square has been left, in case

as it is supposed, room should be required for a portion of the clay to

escape in the action of compression.

Next to these extremely ancient stamped bricks, in point of interest

and antiquity, are specimens of the earliest engraving of letters on

stone. We are informed by various historical writers that Cadmus, a

Phœnician, who lived one thousand five hundred years before Christ, at

a period contemporary with Moses, and who was esteemed as the builder

of the city of Thebes, was the first who taught the Greeks the use of

alphabetic symbols, an art he most likely acquired from the Hebrews.

The most ancient specimen of an engraved inscription now known to

be extant, is the Sigean Inscription, so called from having been

disinterred upon a promontory named Sigeum, situate near the ancient

city of Troy, in Phrygia. It is engraved on a pillar of beautifully

white marble, nine feet high, two feet broad, and eight inches thick,

and which, from the inscription, served as the pedestal of the heathen

god Hermocrates. The letters used in this inscription are the capitals

of the Grecian language, though rudely cut, but read from right to

left like the Hebrew. This specimen of engraving must be about three

thousand years old.

Another not less interesting relic of the earliest age of printing is

found in a Roman signet ring or stamp, approaching in character to that

species of stamp now used by the post-office on letters. This curiosity

is preserved in the British Museum. It is the very earliest specimen we

possess of printing, by means of ink or any similar substance. It is

made of metal, a sort of Roman brass; the ground of which is covered

with a green kind of verdigris rust, with which antique medals are

usually covered. The letters rise flush up to the elevation of the

exterior rim which surrounds it. Its dimensions are, about two inches

long, by one inch broad. At the back of it is a small ring for the

finger, to promote the convenience of holding it. As no person of the

name which is inscribed upon it is mentioned in Roman History, he is

therefore supposed to have been a functionary of some Roman officer,

or private steward, and who, perhaps, used this stamp to save himself

the trouble of writing his name. A stamp somewhat similar, in the

Greek character, is in the possession of the Antiquarian Society, of

Newcastle-upon-Tyne.

It will be perceived that however curious these relics of antiquity may

be, they do not bear any connection with the art of printing books. The

origin of this invention seems to be quite independent of a preceding

knowledge of impressing by means of stamps. What is, however, worthy

of remark, the art of printing books, though on a rude principle, was

known and in use among the Chinese, at least one thousand four hundred

years before it was invented in Europe. The printing of the Chinese

has never resembled anything of the kind in this country. From the

first it has been conducted without moveable types. Each page has

been, and continues to be, a block or cut stamp, which is thus useful

for only one subject--so that every book must have its own blocks. No

press is used. The paper being thin, when laid on the block receives

the impression by being smoothed over with a brush. There is reason

to infer that the art of printing, as thus practised by the Chinese,

may have originated through a knowledge of the still more ancient

Chaldean mode of printing by blocks on clay. But we may expect, from

the well-known ingenuity of the Chinese, and their (in general,) having

the organ of imitation so fully developed, that they will not much

longer continue this primitive method of printing, as an enterprising

practical printer has emigrated, with an excellent assortment of

presses, types, &c., from Edinburgh, to conduct his business in the

celestial empire. We wish him all success.

The discovery of the art of printing with moveable types, which took

place in the fifteenth century, in Germany, was considerably aided by a

fashion, which had been some time prevalent, of cutting blocks of wood

into pictures, or representations of scenes illustrative of Scriptural

history, and printing them on paper, simply by the pressure of the

hand, a brush, or cushion behind.

One of the earliest of these wood-cuts is still extant, and represents

the creation of man, as detailed in the book of Genesis. In the centre

of the picture stands a figure, intended for the Divinity, having the

appearance of an old man with flowing garments, a venerable beard, and

rays proceeding from the head; on the ground, before him, lies a human

being, intended for Adam, fast asleep; and from an opening in his side

is seen proceeding the slender figure of a female, meaning Eve, who is

taken by the hand by God, and is apparently receiving His blessing.

The execution of this, and cuts of a similar nature, is of the rudest

description, and is a striking testimony of the low scale of art at

the time. Pictures of this nature, which were bound up into books,

nevertheless, were the immediate forerunners of the great invention

itself. Books of prints, it will naturally be imagined, would soon be

found imperfect, for want of descriptive text; this, therefore, urged

on the great discovery. The manufacturers of the books, at first, cut

single sentences or words, and stamped them below the pictures; but

this not conveying a sufficient idea of the subject represented, an

anxiety arose to give a lengthened description on the opposite pages.

This it seems was, at length, accomplished; still the sentences were

all cut in a piece, and the notion of having separate letters, so as to

form words at pleasure, was unknown at that period. We will now proceed

to the introduction of the modern art of printing.

Ever since the typographic art has been introduced into modern

Europe in its present form, the best, and one of the most certain

criterions,--which prove the undoubted sense of our species,--exists

in the multiplicity of claims which have been made by several cities

for the honour of affording the earliest shelter to the infancy of this

art. It really appears to be a question yet undecided, to what city,

individual, or even era, to attribute this beneficial invention.

However, there is every reason to believe that in this art, as well as

in most others, the improvements which have subsequently taken place,

have benefited the art itself, as much as that has benefited mankind:

therefore, the question of its origin does not appear to us to be of so

much importance.

Amidst the claims of various individuals, Mr. Bouzer, in his “Origin of

Printing,” says, that this honour ought to be adjudged to one of the

three cities of Haerlem, Mentz, or Strasburg; of which, in his opinion,

the first named city has best established her legitimate right. “But it

appears,” to use his own words, “that all those cities, in a qualified

sense, may claim it, considering the improvements they have made upon

each other.”

The real and original inventor of the modern art of printing, as at

first used, and from whence the improved practice is descended, was

one Laurentius, of Haerlem; who, however, proceeded no further than to

cut separate wooden letters. There is every reason to believe that, at

first, these wooden forms were made upon the principle of the _forma

literarum_ of the Romans. This Laurentius, it appears, made his first

essay about the year 1430; he died ten years afterwards, having first

printed the “Horarium,” the “Speculum Belgicum,” and two editions of

“Donatus.”

The individual on whom history most generally places the honour of

being the earliest discoverer of the art of printing by means of

moveable letters, or types, was John Guttenberg, a citizen of Mayence,

or Mentz, who flourished from the year 1436 to 1466, in the reign

of Frederick III. of Germany. The ingenious Guttenburg was born at

Mayence, in the beginning of the fifteenth century, and removed to

Strasburg about the year 1424, or, perhaps rather earlier. Here he

became acquainted with the above-named Laurentius, with whom he

proceeded to Haerlem, and continued in the employment of Laurentius

for some time. However, he returned to Strasburg, where, in 1435, he

entered into partnership with Andrew Dritzehan, John Riff, and Andrew

Heelman, citizens of Strasburg, binding himself to disclose to them

some important secrets, by which they would make their fortunes.

The workshop was in the house of Dritzehan, who dying, Guttenberg

immediately sent his servant, Lawrence Beildick, to Nicholas, the

brother of the deceased, and requested that no person might be admitted

into the workshop, lest the secret should be discovered, and the

_forms_ stolen. But they had already disappeared; and this fraud, as

well as the claims of Nicholas Dritzehan, to succeed to his brother’s

share, produced a law-suit among the surviving partners. Five witnesses

were examined; and from the evidence of Guttenburg’s servants, it was

incontrovertibly proved that Guttenberg was the first that practised

the art of printing with moveable types in Strasburg; and that on

the death of Andrew Dritzehan, he had expressly ordered the forms to

be broken up, and the types dispersed, lest any one should discover

his secret. The words given in his order, which were supported by

documentary evidence, were these--“Go, take the component parts of

the press, and pull them to pieces; then, no one will understand what

they mean.” In the same document mention is made of _four forms_, kept

together by _two screws_, or _press spindles_, and of letters and pages

being cut up and destroyed.

It has been asserted that Guttenberg stole the types from Laurentius,

with which he repaired to Strasburg, and commenced business; but of

this we can find no corroboration. It has also been said that upon this

occasion, Guttenberg stole his own materials, but this is likewise

unauthenticated.

The result of this law-suit, which occurred in 1439, was a dissolution

of partnership; and Guttenberg, after having exhausted his means in

the effort, proceeded, in 1445, to his native city of Mentz, where he

resumed his typographic labours.

Being ambitious of making his extraordinary invention known, and of

value to himself, but being at the same time deficient in the means, he

opened his mind to a wealthy goldsmith and worker in precious metals,

named John Fust, or Faust, and prevailed on him to advance large sums

of money, in order to make further and more complete trials of the

art. Guttenberg, being thus associated with Faust, the first regular

printing office was begun, and the business carried on in a style

corresponding to the infancy of the art. After many smaller essays in

trying the capabilities of a press and moveable types, Guttenberg had

the hardihood to attempt an edition of the Bible, which he succeeded

in printing complete between the years 1450 and 1455. This celebrated

Bible, which was the first important specimen of the art of printing,

and which, judging from what it has led to, we should certainly esteem

as the most extraordinary and praiseworthy of human productions, was

executed with cut metal types, on six hundred and thirty-seven leaves;

and, from a copy still in existence in the Royal Library of Berlin,

some appear to have been printed on vellum. The work was printed in the

Latin language.

The execution of this--the first printed Bible--which has justly

conferred undying honours on the illustrious Guttenberg, was most

unfortunately, the immediate cause of his ruin. The expenses incident

to carrying on a fatiguing and elaborate process of workmanship, for

a period of five years, being much more considerable than what were

originally contemplated by Faust, he instituted a suit against poor

Guttenberg, who, in consequence of the decision against him, was

obliged to pay interest, and also a part of the capital that had been

advanced. This suit was followed by a dissolution of partnership; and

the whole of Guttenberg’s materials fell into the hands of John Faust.

Besides the above-mentioned Bible, some other specimens of the work of

Guttenberg have been discovered to be in existence. One in particular,

which is worthy of notice, was found some years ago, among a bundle

of old papers, in the archives of Mayence. It is an almanack for the

year 1457, which served as a cover for a register of accounts for that

year. This would most likely be printed towards the close of the year

1456, and may, consequently, be deemed the most ancient specimen of

typographic printing extant, with a certain date.

Antiquaries and Bibliomaniacs have found considerable difficulty

in ascertaining by what process Guttenberg manufactured types; but

it appears to be the prevalent opinion, that those which he first

used were individually cut by the hand; and being all made as near a

height and thickness as possible, they were thus put together in the

forms. The cutting of these types must have been a tedious, as well as

laborious, occupation. This ingenious man, however, soon discovered

the mode of casting his types, by means of moulds; for without this

great accessory to the art of printing, he conceived it was next to

impossible to carry on his business. The art of type-founding is

therefore given to John Guttenberg, in which it would appear he has had

no competitor for the honour; but, it is but justice to state that the

plan of striking the moulds with punches was a subsequent invention

of Peter Schoeffer, his successor, who became partner with Faust, and

afterwards his son-in-law.

That Guttenberg was a person of refined taste in the execution of

his works, is sufficiently obvious to every person who has had the

opportunity of seeing any of them. Adopting a very ancient custom

common in the written copies of the Scriptures and the missals of the

church, he used a large ornamental letter at the commencement of books

and chapters, finely embellished, and surrounded with a variety of

figures as in a frame. The initial letter of the first psalm thus forms

a splendid specimen of the art of printing in its early progress. It is

richly ornamented with foliage, flowers, a bird, and a greyhound, and

is still more beautiful from being printed in a pale blue colour, while

the embellishments are red, and of a transparent appearance.

What became of Guttenberg immediately after the unsuccessful

termination of his law-suit with Faust, is not well known. Like the

illustrious discoverer of the great Western Continent, he seems to have

retired almost broken-hearted from the service of an ungrateful world,

and to have spent most of the remainder of his days in obscurity. It

is ascertained, however, that, in 1465, he received an annual pension

from the Elector Adolphus, but that he only enjoyed this trifling

compensation for his extraordinary invention for a period of three

years, and died in February 1468.

John Faust, who as we have seen, obtained the materials of Guttenberg,

laid claim to the invention, which has been granted to him by

several. Having sufficient capital at his command, he pushed the

trade with great advantage to himself. In the Bibles which he printed

he frequently omitted the capital and initial letters, leaving them

blank for illumination in gold or azure; this was designedly done

for the purpose of imposing upon the public printed copies for M.S.

transcripts. The report which is in circulation concerning Faust,

appears to come in support of this assertion: it being said he was

at Paris, and offering a quantity of his Bibles for sale as M.S. The

French, considering the number of them, and also remarking the exact

similarity and accuracy of them, even to a single point, concluded it

was impossible for the most accurate copyist to have transcribed them

so correctly. They suspected him of necromancy, and either actually

indicted him, or threatened to do, as a magician; and by this means

obtained his secret: whence came the origin of the popular story of Dr.

Faustus, his dealing with the devil, and tragical death.

In 1462, when Mentz was plundered and disfranchised of its former

liberties, printing rapidly spread through a great part of Europe,

particularly its artizans in that branch of art, settled at Haerlem,

Hamburgh, and other places; from Haerlem it travelled to Rome in 1466,

when the Roman character was adopted in 1467, and soon perfected.

In the reign of Henry VI., the Archbishop of Canterbury sent R.

Turnour, master of the robes, and W. Caxton, merchant, to Haerlem,

to learn the art. These individuals privately prevailed upon one

Corselis, an under workman to come to England: and a printing press was

established at Oxford. This appears in a MS. chronicle still preserved;

it informs us, that the execution of the concern entrusted to Turnour

and Caxton cost 1500 marks; and that printing was established at Oxford

before there was any printer or printing presses in France, Italy, or

Spain.

The University of Oxford press was soon discovered to be too remote

from the seat of government, and too great a distance from the sea,

other presses were speedily established at St. Alban’s and the Abbey of

Westminster.

In 1467, printing was established at Tours, at Reuthlingen, and Venice,

in 1469; and it is likely at the same period at Paris, where several of

the German printers were invited by the Doctors of the Sorbonne, who

established a press in that city.

All important as the art of printing is acknowledged to be, yet

three centuries elapsed from the date of the invention before it was

perfected in many of its most necessary details. At first the art

was kept entirely in the hands of learned men, the greatest scholars

often glorying in affixing their names to the works as correctors of

the press, and giving names to the various parts of the mechanism of

the printing-office, as is testified by the classical technicalities

still in use among the workmen. From the great improvement of punching

moulds for casting types by Schoeffer, as formerly mentioned, till

the invention of italic letters by Aldus Manutius, to whom learning

is much indebted, no other improvement of any consequence took place.

It does not appear that mechanical ingenuity was at any time directed

to the improvement of the presses or any other part of the machinery

used in printing, and the consequence was, that till far on in the

eighteenth century, the clumsy presses, which were composed of wood and

iron, and slow and heavy in working, were allowed to screech on as they

had done since the days of Guttenberg, Faust, and Caxton, while the

ink continued to be applied by means of two stuffed balls, at a great

expense of time and labour.

At length, an almost entire revolution was effected in the printing

office, both in the appearance of the workmanship and the mechanism

of the presses. About the same period the art of stereotyping was

discovered, and developed a completely new feature in the history

of printing. One of the chief improvements in typography was, the

discarding of the long s, and every description of contraction; while,

at the same time, the formation of the letters was executed with more

neatness, and greater regularity.

Among the first improvers of the printing press, the most honourable

place is due to the Earl of Stanhope, a nobleman who will be long

remembered for his mechanical genius; besides applying certain lever

powers to the screw and handle of the old wooden press, by which the

labour of the workman was diminished, and finer work effected; he

constructed a press wholly of iron, which is known by his name.

Since the beginning of the present century, and more especially within

the last thirty years, presses wholly of iron, on the nicest scientific

principles, have been invented by men of mechanical genius, so as to

simplify the process of printing in an extraordinary degree; and the

invention of presses composed of cylinders, and wrought by steam, has

triumphantly crowned the improvements in this art. The alteration

effected by steam power has been as great in the printing business,

as in any branch whatever; for example, with the old wooden press,

it took a man two days to complete 1000 sheets, (that is, printed on

both sides); whereas the London “Times,” by means of the steam press

completes 24,000 in one hour! Almost every newspaper in the kingdom is

printed by cylinder-presses, although some are worked by hand instead

of steam; they are also used in other departments of the printing

business.

The introduction of steam-presses would have been of comparatively

little benefit, if it had not been furthered by another invention of a

very simple nature, now of great value to the printer. We here allude

to the invention of the roller for applying the ink, instead of the old

clumsy and inefficient balls. The roller, which is simply a composition

of glue and treacle, cast upon wooden centre-pieces, was invented by a

journeyman printer from Edinburgh, about thirty years ago, and was so

much appreciated by the trade, as at once to spread over the whole of

Europe.

Were it possible to conjure up the spirits of the illustrious

Guttenburg and his contemporaries within the office of the London

“Times,” or some other large printing-office, where everything is

conducted with rapidity, quietness, and order, John Faust might

well think that the printers of the nineteenth century had actually

consummated what he was only accused of in the fifteenth--completed a

compact with the devil!

As it would be a waste of time for us to pretend to describe the

various processes and materials required in this beautiful art, as

we are aware that, without actual observation, no conception can be

formed,--this we know from experience, and though we might, like many

others, have pretended to give a description, we are perfectly aware

that we would have been unintelligible to the majority of our readers,

and very deservedly laughed at for our trouble by any practical printer

who might happen to read our pages; as far as we have gone, however, in

giving a brief historical account of the art of printing, we have no

doubt it will be found correct, as have consulted the best authorities.

STEREOTYPE.

Stereotype, as we have mentioned in the former article, was introduced

about the middle of last century; and as it is so intimately connected

with the art of printing, we could not find a more appropriate place

than immediately following that noble art.--Earl Stanhope has been

named as the inventor; but for this we have not sufficient authority,

and it appears extremely doubtful; as stereotyping appears to have been

invented simultaneously, in various parts of England and Scotland,

by different persons; still it was upwards of sixty years before it

was brought to such perfection as to be applicable for any beneficial

purpose.

When properly made known, it was hailed with approbation by those more

immediately interested--the printers and publishers: but as experience

more fully developed its powers, it was found available only for

particular work. For the better understanding of this art, which is

comparatively little known, we will give a description of the process,

which we are enabled to do by the assistance of an experienced workman.

In _setting_ the types, they are lifted from the case, one by one,

with the right hand, and built in a small iron form, called a

_composing-stick_, held in the left hand of the compositor, who sets

line after line till the stick is filled, when he empties it upon a

_galley_, and commences again in the same manner, till he has got as

much up as will make a page; this page he ties firmly up, and places

upon a smooth stone, or cast iron table. In this manner he continues,

till he gets as many pages as will make a _form_, which consists of

4, 8, 12, or more pages, as the case may be. If this form is to be

worked off at press without stereotyping, the pages are all imposed

in one _chass_, and carried to press for working, and when the whole

of the impression is off, it is thoroughly washed, and carried back

to the compositor for distribution--that is, putting the types in

their proper places. When these pages are to be stereotyped, they are

_imposed_ separately, and carried to the stereotype foundry, where they

are examined, and all dirt taken from the face; they are then slightly

oiled, and a _moulding-frame_ put round each. The frame is filled with

liquid plaster of Paris, which is well rubbed into the face of the type

to expel the air. As soon as this plaster hardens, it is removed from

the page, and shows a complete resemblance of the page from which it is

taken. The mould is put into an oven to dry, where it remains till it

resembles a piece of pottery; it is then put into an iron pan, in which

there is a thin plate of the same metal, called the _floating-plate_;

it has also an iron lid, which is firmly screwed down, and the whole is

immersed in a pot of molten type-metal, which fills the pan by means of

small holes in the corners of the lid. The length of time it remains in

the pot depends upon the heat of the metal, but it is generally from

ten to fifteen minutes, when it is taken out, and put aside to cool.

On opening the pan, nothing is seen but a solid lump of metal, which,

when carefully broke round the mould, a thin plate is obtained from the

mass, exhibiting a perfect appearance of the page from which the mould

was taken.--This is called a stereotype plate, which in general is not

above the eighth of an inch thick, and is printed from in the same

manner as a page of types. Such is the process of stereotyping, which

has become pretty general throughout the trade, but is not much known

to the public.

ENGRAVING.

ON WOOD.

As we have shown in our article on Printing, Wood-engraving was in

fashion prior to the invention of printing. We are informed by Albert

Durer that Engraving on Wood was invented about the year 1520; he may

be a good authority in some matters, but in this he has committed a

mistake of nearly one hundred years; seeing that there is at least

an impression of one engraving on wood, the representation of the

Creation, which was in existence prior to 1430. It was undoubtedly a

piece of rough workmanship; but what could be expected at that early

period of the art? It has been, however, gradually improving ever

since, and it has now attained a point of excellence equal to any

of the fine arts, and calls forth the admiration of every lover of

the beautiful. It would be invidious to select any of the numerous

artists now flourishing--perhaps it would be difficult to make a

selection where so many are upon an equality; and we are of opinion

they themselves are more willing to accept the public approbation as

their reward, than any praise our pen could bestow. All we can do is

to recommend our readers to examine for themselves; they have abundant

opportunities in the numerous illustrated publications that are

daily issued from the press, and bestow that meed of praise upon the

respective artists they may deem proper.

The process of engraving on _wood_ is diametrically distinct and

opposite to that of engraving on _copper_ or _steel_; as in the former,

the shades are produced by the parts of the work which are made most

prominent, and obtrude upon the surface of the substance; whence its

chief merit has been regarded in leaving broad and well-proportioned

lights. The parts to produce this effect being of necessity excavated,

great art and a masterly judgment are necessary to effect this, and at

the same time not to weaken the substance, lest it should be injured in

the pressure necessary to produce an impression.

The substance usually employed for these engravings is wood of a close

grain; on this account box-wood is generally selected. The impressions

are obtained from wood-engravings upon exactly the same principle as

are the impressions from typography; and they can also be worked off

at the same time with the descriptive text. This is a superiority

which wood possesses over other engravings, and recommends itself to

publishers on account of the immense saving in the expense of a double

process in procuring copper-plate illustrations for typographical

works, and enables them to keep pace with the ruling passion of this

literary era--cheap publications.

ON COPPER.

The art of engraving on copper plates, for impressions, is alleged

to have been invented by Peter Schoeffer, one of the early printers,

and son in-law of John Faust, about the year 1450. The honour of this

invention is also claimed by a Florentine goldsmith of the name of

Finguires, who dates his invention in 1540. This artist having used

liquid sulphur to take an impression of some chasing and engraving he

had made, observed a blackness produced by the sulphur left in the

deepest parts of his work, whence he obtained an impression on paper.

But we have no hesitation in giving the preference to Schoeffer, who,

we have previously remarked, was of an ingenious turn, and assisted

Guttenburg in producing moulds for casting his types; in addition to

which, some of the books printed by him are ornamented with head

and tail-pieces, with other rude attempts at engraving; and likewise

because Schoeffer’s claim to the honour was acknowledged before

Finguires was born.

Of engraving there are various kinds; that called by connoisseurs, the

legitimate mode of engraving, is what is termed the _line_ or _stroke_

mode. Numerous have been the British artists who have excelled in this

style, in affording the means of multiplying our graphical productions.

The next species of engraving we will notice is called the _stipple_,

or chalk style,--imitations of chalk drawings. Portraits and historical

pieces are executed in this style, which the celebrated Bartolozzi

brought to perfection.

The third species we will mention, cannot properly be called engraving;

the effect is produced by scraping and rubbing; this kind is called

_chiaro obscuro_, or mezzotinto; producing prints which have the effect

of Indian ink drawings.

A fourth species of engraving is what is commonly used for landscapes,

which produces an effect like a pencil water-colour drawing; which is

called _aquatinta_.

In all of these kinds of engravings upon copper the artists find the

sulphuric acid, or aquafortis, a most powerful agent. Sometimes,

indeed, it is suffered to execute the whole of the process of the

graver, especially when it is called an etching.

For the same reasons as those mentioned with regard to wood engravers,

we shall abstain from naming any of the very eminent artists now living.

We have already observed the mode of obtaining similar effects from

wood and copper, are opposite to each other. The manner in which

impressions from wood engravings are obtained, has likewise been

noticed; and it remains that we observe the mode by which impressions

are obtained from copper-plates. The plate is covered with appropriate

ink; the surface is then carefully cleansed, leaving ink only in the

excavations or lines in the copper. The plate and paper are passed

through a roller press of great power, the roller being covered with a

blanket, which presses the paper into all the crevices of the plate,

and brings away the ink there deposited.

ON STEEL.

For several years steel has been used in great quantities, instead

of copper-plates, by engravers. By this fortunate application of so

durable, and it may be added, so economical a material, not only has

a new field been discovered admirably suited to yield in perfection

the richest and finest graphic productions, which the ingenuity of

modern art can accomplish, but to do so through an amazingly numerous

series of impressions without perceptible deterioration. The art of

engraving on iron or steel for purposes of ornament, and even for

printing, in certain cases, is by no means a discovery of modern times;

but the substitution of the latter for copper, which has invited the

superiority of the British burin to achievements hitherto unattempted

by our artists, is entirely a modern practice.

In the year 1810, Mr. Dyer, an American merchant, residing in London,

obtained a patent for certain improvements in the construction and

method of using plates and presses, &c., the principles of which were

communicated to him by a foreigner residing abroad. This foreigner

was Mr. Jacob Perkin, an ingenious artist of New England, and whose

name has become subsequently so extensively known in this country, in

connection with roller-press printing from hardened steel plates. The

plates used by Mr. Perkins were, on the average, about five-eights of

an inch thick; they were either of steel so tempered as to admit of

the operation of the engraver, or, as was more generally the case,

of steel decarbonated so as to become very pure soft iron, in which

case, after they had received the work on the surface, they were case

hardened by cementation.

The decarbonating process was performed by enclosing the plate of cast

steel properly shaped, in a cast iron box, or case, filled about the

plate to the thickness of about an inch with oxide of iron or rusty

iron filings; in this state the box is luted close, and placed on a

regular fire, where it is kept at a red heat during from three to

twelve days. Generally about nine days is sufficient to decarbonize

a plate five-eighths of an inch in thickness; when the engraving

or etching has been executed, the plate is superficially converted

into steel, by placing it in a box as before, and surrounding it on

all sides by a powder made of equal parts of burned bones, and the

cinders of burned animal matter, such as old shoes or leather. In this

state the box, with its contents, closely luted, must be exposed to a

blood-red heat for three hours; after which, it is taken out of the

fire, and plunged perpendicularly edgeways into cold water, (which has

been previously boiled) to throw off the air. By this means the plate

becomes hardened without the danger of warping or cracking. It is then

tempered or let down by brightening the under surface of the plate with

a bit of stone; after which it is heated by being placed upon a piece

of hot iron, or melted lead, until the rubbed portion acquire a pale

straw-colour. For this purpose, however, the patentee expressed himself

in favour of a bath of oil heated to the temperature of 460 degrees, or

thereabouts of Fahrenheit’s scale. The plate being cooled in water, and

polished on the surface, was ready for use.

A more material peculiarity in Mr. Perkins’ invention, and one which

does not seem to have been approached by any preceding artist, was

the contrivance of what are called _indenting cylinders_. These

are rollers of two or three inches in diameter, and made of steel,

decarbonized by the process above described, so as to be very soft. In

this state they are made to roll backward and forward under a powerful

pressure, over the surface of one of the hardened plates, until all

the figures, letters, or indentations are communicated, with exquisite

precision, in sharp relief upon the cylinder; which, being carefully

hardened and tempered, becomes, by this means, fitted to communicate

an impression to other plates, by an operation similar to that by

which it was originally figured. It will be obvious that one advantage

gained by this method must be the entire saving of the labour and

expense of re-cutting in every case, on different plates, ornaments,

borders, emblematical designs, &c., as these can now be impressed with

little trouble on any number of plates, or in any part thereof, by the

application of the cylinder. At first sight, the performance of such

an operation as the one now alluded to may appear difficult, if not

impracticable; and, indeed, many persons on its first announcement were

disposed to doubt or deny its possibility altogether. With a proper and

powerful apparatus, however, this method of transferring engravings

from plates to cylinders, and _vice versa_, is every day performed with

facility and success, not only in the production of bank notes, labels,

&c., but in works exhibiting very elaborate engravings.

LITHOGRAPHY.

A Historical Account of Useful Inventions and Scientific Discoveries Being a manual of instruction and entertainment. · 第 1 / 18 段