This number is
checked by the subsequent stages of the process, which, ceasing
to have the character of copying by a tool or pattern, become
consequently more expensive. In each individual production, form
alone is given by casting; the colouring must be the work of the
pencil, guided by the skill of the artist.
Of copying by moulding
112. This method of producing multitudes of individuals
having an exact resemblance to each other in external shape, is
adopted very widely in the arts. The substances employed are,
either naturally or by artificial preparation, in a soft or
plastic state; they are then compressed by mechanical force,
sometimes assisted by heat, into a mould of the required form.
113. Of bricks and tiles. An oblong box of wood fitting upon
a bottom fixed to the brickmaker's bench, is the mould from which
every brick is formed. A portion of the plastic mixture of which
the bricks consist is made ready by less skilful hands: the
workman first sprinkles a little sand into the mould, and then
throws the clay into it with some force; at the same time rapidly
working it with his fingers, so as to make it completely close up
to the corners.
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