GOLD, SILVER, LEAD, TIN, PLATINA, SULPHUR, GEMS OR PRECIOUS
STONES, AS DIAMONDS, RUBIES, EMERALDS, TURQUOIS, PEARLS,
MOTHER-OR-PEARLS, AND IVORY.
What is Gold?
The purest and most precious of metals: it is sometimes found in solid
masses, as in California, Peru, Hungary, &c.; in a shape resembling
the branches of plants; in thin plates covering other bodies, as in
Siberia; sometimes in a crystal form. It, however, generally occurs in
a metallic state, and most commonly in the form of grains.
What is it called when found in a perfect metallic form?
Native gold: it is, however, seldom met with perfectly pure, being
frequently alloyed with silver, copper, iron, or platina; sometimes
concealed in other minerals; from which, if sufficiently abundant, it
is extracted by art.
Where and in what manner is Gold generally found?
All parts of the earth afford gold; though with great difference in
point of purity and abundance. It is chiefly obtained from mines. Many
rivers contain gold in their sands, especially those of California and
Guinea. Gold mines are of rare occurrence in Europe, but the metal is
found in some of its rivers; among its mines, those of Upper Hungary
are the most considerable. China and Japan are rich in this metal;
many parts of Asia also possess it. Australia produces quantities of
the metal. It is also found in the eastern parts and interior of
Africa, where gold dust is collected in great quantities from earth
deposited by the rivers. But it is in America that gold is found in
the greatest abundance, particularly in the State of California, and
in some parts of South America, as Brazil, Peru, Chili, &c.
_Guinea_, a country of Western Africa.
What are the uses of Gold?
It is used for money, jewelry, plate, &c. It is also employed in
various ways in the arts.
What is the character of Gold?
Gold is so ductile and malleable, that an ounce of it may be drawn
into a thread of 73 leagues in length; or beaten into 160 leaves of 9
inches square, and thin enough to be carried away by the slightest
wind. It readily assumes any form that human art can bestow upon it:
its color is unalterable, and the beautiful polish of which it is
susceptible, renders it the best of all metals for ornamental
purposes. It is indestructible by air, water, or fire. Gold is the
heaviest of all metals, except platina; it is neither very elastic,
nor very hard.
_League_, a measure of length containing three miles.
_Indestructible_, incapable of being destroyed.
Is not the use of Gold quite ancient?
Yes; it appears to have been very early known to the inhabitants of
the world. In the 13th Chapter of Genesis, Abram is spoken of as very
rich in silver and gold; and in the 2d Chapter of the same book, the
"land of Hevilath" (now in the eastern part of Arabia Felix,) is
pointed out as having gold. Arabia was famed for the fineness and
quality of its gold. In the time of Solomon, the gold of Ophir seems
to have been much esteemed, as it is recorded that the gold used in
the building of the Temple was brought from that place by the
merchant-vessels of Hiram, King of Tyre. Ophir is supposed to have
been situated somewhere in the East Indies.
What is Silver?
A beautiful white shining metal, next to gold in value, and, like that
precious substance, of great antiquity. It is found in Sweden, Norway,
and the polar latitudes: when it occurs in hot climates, it is
generally amidst mountains, covered with perpetual snow.
_Latitude_, breadth, width; in Geography, the distance of a
place in degrees, north or south, from the Equator.
Where are the richest Silver Mines found?
In South America, especially among the Andes; the mines of Mexico, and
those of Nevada, also, are rich in this metal. The richest and most
important silver mines in Europe are those of Königsberg, in Norway,
and of Andalusia, in Spain. With the exception of gold, silver is the
most ductile of all metals: a single grain may be extended into a
plate 126 inches long, and half an inch broad. It is capable of still
further extension, but its tenacity is inferior even to that of iron
or copper. A silver wire one-tenth of an inch thick will scarcely bear
a weight of 290 pounds, whilst a gold wire of the same thickness will
support nearly double that weight. Like some other metals, it is
unalterable by air or moisture, but by an intense heat may be
volatilized, being sometimes found in the soot of chimneys where large
quantities are melted.
_Volatilized_, made to fly off by evaporation.
In what state is Silver usually found?
It is rarely found in a state of purity, being generally mixed with
other metals, as gold, lead, &c. Masses of native silver are of no
determinate form; being found sometimes in small branches, sometimes
in threads, or very frequently in leaves, as in the Siberian mines.
Native, or pure silver is chiefly found in the mines of Potosi. Silver
was used as money in commerce 1100 years before the foundation of
Rome.
_Commerce_, trade of one nation with another, or different
persons, &c. with each other.
What is Tin?
A white metal, softer than any other excepting lead, more elastic, and
more sonorous. Though tin is the lightest of all metals, its ore is,
when rich, the heaviest of all metallic ores. It has both smell and
taste; is less ductile than some harder metals, though it may be
beaten into very thin leaves; and it fuses so quickly, that it
requires a heat much less than is sufficient to make it red-hot.
Was not the use of Tin very early known?
Tin was found in Britain from the earliest ages; the Phenicians traded
to Cornwall for this metal 600 years before Christ.
Where are the principal Tin Mines?
In Saxony, Cornwall, and Bohemia. Tin is also found in Spain, Sumatra,
Siam, Mexico, and Chili. A few specimens have been found at Goshen, in
Massachusetts.
_Specimens_, samples.
In what state is Tin generally found?
Tin is sometimes found native or pure, but most frequently alloyed
with other metals: the working of tin mines is attended with much
difficulty, on account of their great depth, and the hard rocks which
obstruct the progress of the miners, who are often obliged to cut
through them. This metal is very useful in the making of domestic
utensils, for coating the inside of copper and iron vessels, and for
various other purposes.
_Obstruct_, to stand in the way.
What is Lead?
A coarse, heavy metal, of a bluish grey color: it is so soft and
flexible, that it is easily cut with a knife, and rolled out into
sheets, &c.; it is very fusible and inelastic, but less ductile and
sonorous, than any other metal. Next to gold, platina, and mercury, it
is the heaviest of the metals, being eleven times heavier than an
equal bulk of water. This metal loses its malleability in proportion
as it is heated: as soon as it melts it calcines, and greyish-colored
ashes are formed on its surface; when returning from a fluid to a
solid state, it is easily divided into small grains or powder, or
formed into shot, &c. Lead was in common use among the ancients.
_Flexible_, yielding, easily bent.
_Sonorous_, giving sound when struck.
Where is Lead found?
In various countries; but it abounds principally in Great Britain and
Spain; the lead mines of Illinois, Wisconsin, and Iowa, are among the
richest in the world. Lead is a metal of great utility; it easily
melts and mixes with gold, silver, and copper; hence it is employed in
refining gold and silver, as it separates all the dirt and impurities
from them; it is much used in building, particularly for covering
gutters, pipes, &c.; lead is also used in varnishes and oil-painting,
and makes the basis of the glazing of all the earthen and pottery
wares.
_Refining_, cleansing, purifying.
_Varnishes_, preparations for beautifying and preserving
various articles.
What is peculiar to the ore of Lead?
The ore of this metal is so poisonous, that the steam arising from the
furnaces in which it is smelted infects the grass of all the
neighboring places, and kills the animals which feed on it: culinary
vessels lined with a mixture of tin and lead, are apt to convey
pernicious qualities to the food prepared in them. There are various
preparations of lead, serving for different purposes.
_Infects_, corrupts.
_Culinary_, adapted to the purposes of cooking.
_Pernicious_, hurtful, dangerous.
_Ore_, the mineral soil, earth, or stone dug out of the
mines, which contains the metal.
What is Black Lead?
It is a kind of mineral, of a deep shining black or bluish color, soft
and unctuous to the touch; it is insoluble in acids, and infusible by
fire. Black lead has been found in many parts of the world, in a state
of greater or less purity, but it is the English black lead which is
the most esteemed.
_Insoluble_, incapable of dissolving.
_Infusible_, not capable of being melted.
Is Black Lead a proper term for this mineral?
No; because, in reality, there is not a particle of lead in it. On the
spot where it is procured, it is called by two or three different
names, but the most usual is Plumbago.
Where is the best Black Lead found?
The best and greatest quantity is found in England, in a mine near
Keswick, in Cumberland. It is much used for pencils or crayons, for
writing, drawing, &c.; for this purpose it is sawn into slips, and
fitted into a groove in a strip of soft wood, as cedar, &c., over
which another is placed and fastened with glue.
What is Platina?
A metallic substance, more recently discovered than the metals already
described; and analogous to the perfect metals, especially gold,--many
of whose properties it possesses.
_Analogous_, bearing a resemblance.
Whence is its name derived?
It is the diminutive of _plata_, silver, to which it appears very
similar; platina being a silver-colored metal, in small grains.
_Diminutive_, a word lessening the meaning of the original.
Whence is it obtained?
Mostly from Russia, and, also from South America. Its color does not
tarnish by exposure to the air, and appears to be equally permanent
with that of pure gold; the metal is indestructible by fire. Platina
is capable of being alloyed with all metals; is fused with difficulty,
but by great labor may be rendered malleable: it is also the heaviest
metal, being 21 times heavier than water.
_Permanent_, lasting.
Are there any other Metals besides those already mentioned?
In addition to the metals known and used by the ancients, the chemical
science of later ages has, by decomposing other earths, added more
than thirty to the number of metals, some of them more curious than
useful; several of these are lighter than water. All the metals
possess different and distinct properties from each other. They are
divided into two classes, the malleable and the brittle metals. These
last may be again divided into two others,--namely, those which are
easily, and those which are with difficulty fused.
What do you mean by Metallurgy?
The art of obtaining metals from their ores, comprising the processes
of assaying, refining, smelting, &c. By assaying is meant, the
particular manner of examining an ore or mixed metal, according to its
nature, so as to discover not only what metals and what proportions of
metal may be obtained from it, but also what other mineral substances
or earths may be contained in it.
What do the terms Refining and Smelting signify?
Refining is the art of rendering the metal free from all impurities.
Smelting means the melting of a metal from its ore in a smelting
furnace, in order to separate the metallic parts from the sulphur,
arsenic, and the earthy and stony substances with which they may be
combined.
What is Sulphur?
An inflammable, fossil substance, of a dry, solid, friable nature,
melting with a small proportion of heat;--when fired in the open air,
burning almost entirely away with a blue flame and noxious vapor. It
is abundantly diffused in many places, especially where metallic
minerals are found; but more particularly in those districts where
subterranean fires and volcanoes exist. It is also found combined with
many different substances.
Describe the nature of Sulphur, and the places where it is mostly
found.
Sulphur almost pure, called native or virgin sulphur, is found in
volcanoes and grottoes, in the form of transparent crystals; but the
greatest quantity which exists naturally is combined with metals in
ores. Sulphur is both fusible and volatile,--which qualities enable us
to procure it from those minerals by the process of sublimation: it
unites easily, in different degrees, with all metallic matters,
excepting gold, platina, and zinc.
_Sublimation_, the act of bringing a solid substance into
the state of vapor by heat, and condensing it again by cold.
Are not its uses very extensive?
Yes, both in the arts and in chemistry: it is well known to be a
principal ingredient in the preparation of gunpowder and fire-works;
it is also used for whitening wool, straw, silk, &c.; many other
matters exposed to the vapors of sulphur when burning, quickly lose
their color, which no other substance had been able to destroy.
Sulphur is also frequently found in mineral waters.
Whence are the greatest quantities of Sulphur brought?
The largest quantities are brought from Saxony, in irregular masses,
which are afterwards melted and cast into small rolls. There are about
four species of sulphur; namely, the yellow native sulphur, which in
its purest state is clear, and of a pale straw color, found in the
gold mines of Peru; in Hungary, and some other places: the green
native sulphur, which is harder than the other, is found in small
crust-like masses; this sort is chiefly confined to Mount Vesuvius:
and the grey native sulphur, common in Iceland and many other places.
Native sulphur is also found at the coal mines, near Richmond,
Virginia; in Connecticut, Pennsylvania, and other parts of the United
States.
Which is the most rare and beautiful of all the kinds?
The red native sulphur; it is mostly of a fine glowing red, very
bright and transparent; it is found, like the first-mentioned sort, in
the gold mines of Peru. Common sulphur, such as is used in trade and
the arts, is of a pale yellow color; and possesses a peculiar and
disagreeable smell, particularly when heated or rubbed. This is mostly
extracted from the metallic sulphurets, and is commonly called
brimstone. It is the sort employed in making matches.
Is there not another substance also employed in the manufacture of
matches?
Yes: Phosphorus, a peculiar substance, chiefly of animal origin. It is
mostly procured by the decomposition of the phosphoric acid which is
found in bones. It was accidentally discovered at Hamburgh, in 1669,
by an alchemist named Brandt.
_Alchemist_, one skilled in Alchemy.[15]
[Footnote 15: See Chapter XVIII., article Chemistry.]
What is the nature of Phosphorus?
It is a solid, inflammable substance, which burns when in contact with
atmospheric air. It is used in various chemical experiments, and for
making matches; for various kinds of fire-works, &c. It will combine
with all metals except gold and zinc; and also with some earths. Some
animals, as the glow-worm, possess very peculiar phosphorescent
qualities.
_Phosphorescent_, having a phosphoric property, emitting
peculiar light like phosphorus.
What is Arsenic?
A heavy metallic substance, very volatile, and highly inflammable; so
caustic or corrosive to animals, as to become a violent poison in all
its states. In its metallic state it is used in several of the arts:
it is employed in the manufacture of factitious metals: it is of use
to the dyer in forming some of his colors; and for that purpose is
generally combined with potassa. It is used in the making of small
shot, and also in the manufacture of glass, to which it gives
transparency; in whitening copper; in calico printing; in the
preparation of colors for the painter; and in the working of platina,
and some other metals, to render them more easily fusible.
_Caustic_, dry, burning.
_Corrosive_, apt to corrode, to eat away, to penetrate.
How is the white powdered arsenic prepared?
By submitting the ore to a strong heat in a peculiar kind of furnace;
this produces a dark grey powder, which is again heated in close iron
vessels; this separates it from its impurities, and the arsenic is
obtained in thick, solid masses; these, by exposure to the air, fall
into a fine, white powder.
From what is the word Arsenic derived?
From a Greek word, signifying _masculine_--powerful (as a poison).
Arsenic is dug out of mines in Saxony, near Goslar; in Bohemia; in
England, in the Mendip Hills, in great quantities. It has so strong a
corrosive quality as sometimes to burn the hands and feet of the
miners; it is a deadly poison for all known animals. This poisonous
mineral is not found native in its perfect form, being generally
united with metallic ores.
What do you mean by Gems?
The word gem is used as a common name for all precious stones or
jewels; they consist of the siliceous earths; and are much valued for
their lustre, transparency, color, hardness, and rarity. There are
many different kinds of precious stones, each distinguished by its
peculiar character.
How are they divided?
Into the pellucid gems, which are of great lustre, and extremely hard,
as the diamond; the semi-pellucid, those which are not so transparent,
but yet of great beauty; those of one color, as the emerald or
turquois; and those variegated or veined with different colors. Gems
are sometimes found of regular shapes, with a natural polish, near the
beds of rivers after great rains; these are of the pebble kind.
Sometimes they are found of irregular shapes, with a rough coat, in
mines and the clefts of rocks. Pearls, though not stones, are also
ranked among the number of gems.
_Pellucid_, clear as a drop of water.
_Semi-pellucid_, half pellucid.
Describe the Diamond.
The diamond is a precious stone, the first in rank of all the gems,
and valued for its beautiful lustre; it is the hardest of all stones,
as well as the most valuable. The most esteemed are colorless. A
diamond in its natural state as it comes out of the mine, and before
it is cut, is called rough, because it has no brilliancy, but is
covered with an earthy crust. The diamond is the Adamant of the
ancients; hence the expression "hard as adamant," from its being the
hardest substance in nature. The cutting of diamonds is a work of
labor, and requires great skill; the polishing is performed by a mill
of simple construction.
Where are they mostly found?
In yellow ochreous earths; in mines; and likewise in torrents, which
have torn them from their beds. In former times, all the diamonds that
were known were brought from the famous mines of Golconda, in
Hindostan; the islands of Molucca and Borneo have also produced many
valuable stones. The diamond mines of Golconda are now so exhausted,
that they are not thought worth the expense of working; these gems are
now brought chiefly from Brazil, in South America.
What is meant by Ochreous?
Consisting of ochre, a kind of earth with a rough and dusty surface,
composed of fine, soft, clayey particles, which readily separate in
water. There are various colored ochres, as red, yellow, blue, green,
&c.; they are very useful in many of the arts.
What term is used to denote the quality of the Diamond?
In speaking of the value of diamonds, we distinguish them as "diamonds
of the first water," meaning those which possess the greatest
perfection and purity, which ought to be that of the clearest drop of
water: when they fall short of this perfection, they are said to be
"of the second or third water," and so on till the stone may be
properly called a colored one.
What is the Ruby?
A beautiful gem of a red color; in its perfect state it is of great
value. The ruby is often found perfectly pure and free from all spots
or blemishes; but its value is much more frequently lessened by them,
especially in the larger stones. It is very hard, being second only to
the diamond in this respect; and is often naturally so bright and pure
on the surface as to need no polishing; it is often worn in rings,
&c., in its rough or native state. The color of rubies varies from the
deepest to the palest red, all having more or less of a purplish
tinge, which is more plainly perceived in the deeper colored specimens
than in the paler ones.
Where are Rubies found?
They are mostly found in gold mines. We have the true rubies only from
the East. The Isle of Ceylon has long been celebrated for these gems;
they are found in a river which descends from the mountains; they are
brighter and more beautiful than those obtained in other parts, but
are very rare. Some crystals are frequently found tinged with the true
color of the ruby, but these want its lustre and hardness.
Describe the Emerald.
It is a precious stone of a beautiful transparent green color, and,
when in a state of perfection, nearly equal to the ruby in hardness.
The finest and best are found in America, especially among the
mountains of Peru; they are also obtained from a few places in the
East. These gems are often counterfeited, as are most of the precious
stones, there being even false diamonds; the genuine may be known by
their extreme hardness and brilliancy.
_Counterfeited_, imitated with a view to defraud.
_Genuine_, true, real.
What is the Turquois?
A beautiful blue stone; it is one of the softest of the gems, and some
varieties are often used for seals, as they admit of being engraved
upon. The turquois is easily imitated, and that often so perfectly as
to render it very difficult to distinguish the counterfeit from the
true gem.
In what countries are they found?
The Oriental Turquois comes from Persia, the Indies, and some parts of
Turkey; the turquois is also found in various parts of Europe, as
Germany, Spain, and France.
What is Engraving?
The art of cutting metals or precious stones, and representing thereon
figures, letters, and devices; the term is, however, more particularly
applied to the art of producing figures or designs on metal, &c., for
the purpose of being subsequently printed on paper. The ancients are
well known to have excelled in engraving on precious stones; many
specimens have been preserved, which surpass anything of the kind
produced by the moderns. This art is frequently alluded to in the
Bible. Engraving on wood, according to some authors, was introduced
into Europe from China by Venetian merchants; it is certain the art
was practised in eastern and northern Italy as early as the thirteenth
century. The invention of copper-plate engraving has been ascribed to
a goldsmith of Florence, about the year 1460.
_Device_, that which is formed by design.
_Design_, a representation of a thing by an outline; a
sketch.
Describe Wood Engraving.
The subject is drawn on a block of box or pear-tree wood with a
black-lead pencil, or with a pen and Indian ink; the wood is then cut
away, so as to leave the lines which have been drawn, as raised parts.
The ink is next applied, and by pressing damp paper upon the block,
the impressions are obtained. Albert Durer, a celebrated painter of
Germany, brought the art of engraving on wood and metal, and taking
off impressions on paper, &c., to great perfection.
How is engraving on copper, steel, &c., performed?
This sort of engraving is performed with a sharp-pointed instrument
called a _graver_, by means of which figures, landscapes, &c., are
traced upon a flat surface of the metal: the lines are then filled
with ink or a similar composition, and the paper pressed on the plate.
When taken off, an exact copy of the plate is impressed upon its
surface.
[Illustration: COCHINEAL INSECTS AND PLANTS.]
What is Lithography?
A species of engraving on stone, from which impressions can be taken
much more expeditiously and economically than from metal. The process
depends upon the following principles:--First, the facility with which
calcareous stones imbibe water; second, the power of oily substances
to repel water. When drawings are executed upon the stone with crayons
composed of oily materials, and the surface of the stone is washed
over with water, the moisture is imbibed by the stone, but repelled
from the engraving; and when the ink, which also contains oily
substances, is applied, it adheres only to the drawing, and not to the
other portions of the stone. The block is then passed through a press,
and the impressions are taken off; as many as 70,000 perfect copies
have been obtained from a single stone.
_Expeditiously_, with celerity or dispatch.
_Economically_, with economy; with frugality.
You describe Pearls as being ranked among the number of Gems, although
they are not Stones; what kind of substance are they?
Pearls are excrescences found in the shells of a large species of
oyster, which are supposed to be produced by a disease of the fish.
The best pearls are generally taken from the most fleshy part of the
oyster, near the hinge of the shell, but inferior kinds are found in
all parts of the fish, and adhering to the shells. Pearls, from many
allusions made to them in the Old Testament, were not only known to
the ancients, but were regarded by them as costly and precious gems.
How do they get the Oysters which contain them?
By diving under water and picking the oysters from the large beds at
the bottom of the sea; or the rocks to which they adhere. The divers
cast all the oysters they take into their boats, and carry them
ashore, where they deposit them in heaps; they are then left till they
become putrid, this being necessary in order to remove the pearls
easily from the rough matter by which they are surrounded.
What sea produces the best and greatest number of Pearls?
The finest and greatest quantities are obtained off the coast of
Ceylon; the pearl oyster is also found in the seas of the East Indies;
in those of America, and in some parts of the European seas; but these
last are much inferior. The Oriental pearls are the finest on account
of their size, color, and beauty, being of a silvery white; while the
Occidental pearls are smaller, and frequently tinged with a yellow or
blackish hue.
_Tinged_, slightly colored.
Does not the Pearl Oyster produce a substance called Mother-of-Pearl?
No; the beautiful substance so much used for inlaying boxes, and for
ornamental knife-handles, &c., is produced from the shell, not of the
pearl oyster, but of another sea-fish of the oyster kind.
What is Inlaying?
The art of ornamenting a plain surface of wood, or other material,
with thin slices or leaves of a finer wood, of a different kind; as
mahogany inlaid with ebony, &c., or with ivory, and other substances.
There are two kinds of inlaying; one, of the more ordinary sort, which
consists only of compartments of different kinds of wood, inlaid with
one another; the other, requiring greater skill, represents flowers,
birds, and other figures. The thin plates of wood or other substance,
being sawed into slips, and cut into the required forms, are carefully
joined, and afterwards strongly glued down on the block of wood, &c.,
intended to be thus ornamented.
_Compartment_, a division, a separate part.
What is Ebony?
A hard, black-colored wood, growing in the countries of the Levant,
&c.; there are, however, several black woods of different kinds which
are also called ebony.
What is Ivory?
The tooth or tusk of the Elephant, which grows on each side of his
trunk; it is somewhat like a horn in shape. Ivory is much esteemed for
its beautiful white color, polish, and fine grain when wrought. It has
been used from the remotest ages of antiquity; in the Scriptures we
read of Solomon's ivory throne, and also of "vessels of ivory," and
"beds of ivory:" by which it appears to have been a chief article of
luxury, as well as of trade.
_Remotest_, most distant.
Of what countries is the Elephant an inhabitant?
Of many parts of Asia and Africa. The elephant is the largest
quadruped now in existence; it is extremely sagacious, docile and
friendly: in the countries where they live they are trained to useful
labor, and by their great strength are enabled to perform tasks which
a man or horse could not accomplish: among the native princes they
were, and even still are, used in war: with them the inhabitants are
able to hunt and destroy the lion, tiger, and other beasts of prey.
With their long trunk, or proboscis, they can perform almost
everything which man can with his hands.
_Quadruped_, an animal with four feet.