CONDENSED FROM THE BUILDING NEWS.

There is a charm and feeling about work executed by the hand, which

gives it a value no mere machine work can possess. Machine work, from

its very nature, necessitates a repetition of pattern, which cannot

be avoided. Hand-work, on the contrary, can imitate every variety, and

follow nature so closely that no two pieces need be alike. There

is also in hand-work a wide scope for the inventive faculty and

the exercise of good taste (both in form and color) and skillful

workmanship. As a rule, strong contrasts between the ground and the

graining color should be avoided. The figure and grain should of

course be seen clearly, but only so clearly as to be distinct, without

interfering with the general and uniform quietness of tone necessary

to fulfil the conditions required by the laws of harmony and good

taste. Violent contrasts and gaudy coloring are always vulgar,

brilliancy and richness of color are not necessarily vulgar; it is

the absence of the guiding power of knowledge and pure taste in their

arrangement which degrades them to the rank of vulgarity. We have

before spoken of the importance of good combing, and of the various

kinds of combs used; we now proceed to describe how the work is done.

The graining color is brushed over the work, in the ordinary manner,

with a pound-brush, care being taken not to put too much color on,

or else it is very liable to be dirty. A dry duster is now used to

stipple with, which, if properly done, will distribute the color

evenly; it is now ready for combing. In the real oak it will be found,

as a rule, that the grain is invariably coarser on one side of the

panel than on the other; this arises from the very nature of the

growth of the tree; it is, therefore, well to imitate this

pattern, and in order to do so we take first a medium or coarse cut

gutta-percha comb, and draw it down one side of the panel; then use a

finer one to complete it. This comb will leave the marks of the grain

in clear unbroken lines from top to bottom of the panel. We now take a

fine steel comb and go over the whole of the previous combing, moving

it in a slanting or diagonal direction across the previous grain, or

with a quick and short wavy motion or curl; both the former and the

latter motion will break up the long lines, left by the gutta-percha

comb, into short bits, which of course represent the pores or grains

of the real wood. There are several other motions of the comb having

the same end in view; and by using the gutta-percha or cork combs, in

conjunction with the fine steel, an infinite variety of grain may be

produced. Steel combs, with one or more folds of thin rag placed

over the ends of the teeth are a style of comb which has nothing to

recommend it. A natural variation in the grain may be produced by one

comb alone, according to the manner in which it is held. For instance,

if we take a coarse or broad-toothed gutta-percha comb, and commence

at the top of a panel, with the comb, placed at its full width: if

drawn down in this position it will leave a grain of the same width

as the width of the teeth: but if we start with the full width, and

gradually turn the comb or slightly incline it to one side--that is to

say, on its edge, we thereby graduate the grain from coarse to fine

at pleasure, and by holding the comb at a certain inclination we may

actually make very fine the coarse comb. A very important point is

the formation of the joints in the wood, as much of the effect of

otherwise good work is lost in consequence of neglect in this respect.

In looking at a real oak door, the joints of the stiles and rails are

clearly and sharply defined, not by any defect of workmanship, but

by the difference in the run of the grain, the stiles being

perpendicular, and the rails horizontal. The rails being cut sharp

off by the stiles, show a perfectly straight line. The light also acts

differently upon the two, simply because the grain or fibre of the

wood is exposed to its influence under different aspects. This also

tends to produce a difference in the depth of the color of rails and

stiles, and panels also. It will be evident that no imitations can be

considered really good except they include these seemingly unimportant

points.

It is a common practice for grainers to imitate a broad piece of heart

or sap of oak, upon the back rail of almost every door they do, and

many of them are not even content with that, but daub the stiles over

from top to bottom with it also. There is nothing so vulgar or in

such bad taste. It should only be done upon those parts of the work on

which it would appear on a real oak door, namely, on the edges of the

doors and on mouldings. There is a vulgar pretentiousness about what

we may call the sappy style of work which is very undesirable. The

figures cross the grain more or less abruptly and of course are of

different shapes, sizes, and forms, a knowledge of which can only be

acquired by study of the real wood. The figure may be wiped out with

a piece of soft rag, held tight over the thumb nail. This should have

two or three folds over the nail, the superfluous rag being held by

the other hand to prevent it hanging down and smearing the grain; and

every time a figure is wiped, the rag should be moved slightly, so

that the same part of the rag will not be used twice, thus insuring

clean work. It will often happen that the thumb-nail will get broken,

or is too weak to stand the work; in these cases, or, in fact, in

any case, a good substitute or artificial thumb-nail may be made of

gutta-percha, thus: A piece of thin sheet gutta-percha is put into

warm water, and, while soft, is wrapped around the end of the thumb up

to the first joint. It is then pressed with the hand, so as to fit

and take the shape of the thumb and nail. This cannot be done at one

heating, but will have to be put into the hot water again, and the end

pinched and squeezed into form to the shape of the nail, and to fit

easily upon the thumb. When this gets hard, it may be trimmed into

perfect form with a penknife. This artificial nail will answer the

purpose admirably if properly made; and even when the natural nail

is good, the gutta-percha will serve to save it from injury. Good

figuring may also be done by using the blank end of the steel

comb with a rag folded over its edge. We have also used a piece of

gutta-percha to take out the lights. This should be square-ended,

about one inch wide, and three or four inches long, and will do

successful work of a certain class, but not of the best. Many grainers

use a piece of thin horn, in shape something like a spatula, about

three or four inches long and three quarters of an inch wide, with

rounded ends, and quite flexible. With this tool the figure is cut

or scooped out--a sort of quick, side-long motion, very difficult to

describe, and requiring a very considerable amount of practice

before it can be worked with any success. There is, however, the same

objection to this tool as may be urged against the gutta-percha for

figuring, namely, that neither of them take the color clean away, but

leave an accumulation of color on the edge of the figure, which is

fatal to good work; and therefore we cannot honestly recommend the

use of any method but the wiping out with the thumb-nail or its

substitute. When the figure is wiped out it will require to be

softened. By softening, we mean the imitation of those half shades

seen upon and about the figures in the real wood. Between and around

the lights or figure in oak, there is always a lighter tint of color;

this is imitated by doubling a piece of rag into a small roll, and

with the side of this the grain is partially wiped away, but not to

the extent of taking off the whole of the grain. A recent but most

admirable system of graining oak, by means of over-combing, is worked

exactly the reverse of any of the foregoing methods; that is to

say, the figure is first wiped out, and the combing or grain is done

afterwards, when the graining color is dry, in this wise: The graining

color is mixed somewhat thinner than for ordinary graining, and is

brushed over the work sparingly, leaving it just sufficiently strong

to show a clear distinction between the ground and the color. The

light or figure is then softened by drawing the end of a flat hog-hair

fitch, or a small thin mottler, across each figure, and slightly

softening with the badger-hair softener. The figure is broken up a

little with fine lines across it in parts, such as may be seen in the

real wood; but previous to wiping out the figure, streaks of light

should be wiped out and softened on one side of the panel or across

the stiles, in imitation of the reflective lights seen in oak. The

color should also be partially wiped off the rails or stiles at their

junction; this tends to define the joint. The color is now let to

dry hard, when it will be ready for over-combing--that is, combing or

graining over the figure (hence its name), and this will have to be

done somewhat differently to the ordinary combing. As thus: The color

is rubbed in as before, and combed solely with the gutta-percha combs,

but these are specially cut for the purpose; they are best about 2 in.

wide. The first must be cut with teeth about three-sixteenths of an

inch in width, the next one-eighth, and the third about one-sixteenth.

The broad-toothed comb is first used, and must be drawn down the

panel, with a wavy motion, in short or long curls; either will

answer our purpose now. The next size of comb is then drawn straight

down--the straighter the better. This has the effect of breaking the

wavy combing into short and long straight bits, similar to the pores

or grain of the real wood. Both the first and second combing may be

varied by holding the comb in a slanting direction, and may be fine or

coarse, according to the width of the combs used; now take a soft rag

folded, and with this partially clear off the grain which runs over

the figure, leaving only a sufficient quantity crossing the light

or figure, to be just distinguished, exactly as it appears upon the

figure in real oak. The grain is also wiped off in parts on the plain

spaces between the figure, in order to break it up and take away any

formality. If this method be well and probably done, a thoroughly

deceptive imitation may be produced; and except this end be kept in

view, no really good work will result.

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Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 13 / 194 题