A stereotype plate may, it is evident, be
obtained at once from this arrangement of matrices. The objection
to the plan is the great expense of keeping so large a collection
of matrices.
As the original composition does not readily admit of change,
stereotype plates can only be applied with advantage to cases
where an extraordinary number of copies are demanded, or where
the work consists of figures, and it is of great importance to
ensure accuracy. Trifling alterations may, however, be made in it
from time to time; and thus mathematical tables may, by the
gradual extirpation of error, at last become perfect. This mode
of producing copies possesses, in common with that by moveable
types, the advantage of admitting the use of woodcuts: the copy
of the woodcut in the stereotype plate being equally perfect.
with that of the moveable type. This union is of considerable
importance, and cannot be accomplished with engravings on copper.
95. Lettering books. The gilt letters on the backs of books
are formed by placing a piece of gold leaf upon the leather, and
pressing upon it brass letters previously heated: these cause the
gold immediately under them to adhere to the leather, whilst the
rest of the metal is easily brushed away.
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