97. Printing oilcloth. After the canvas, which forms the
basis of oilcloth, has been covered with paint of one uniform
tint, the remainder of the processes which it passes through, are
a series of copyings by surface printing, from patterns formed
upon wooden blocks very similar to those employed by the calico
printer. Each colour requiring a distinct set of blocks, those
oilcloths with the greatest variety of colours are most
expensive.
There are several other varieties of printing which we shall
briefly notice as arts of copying; which, although not strictly
surface printing, yet are more allied to it than that from
copperplates.
98. Letter copying. In one of the modes of performing this
process, a sheet of very thin paper is damped, and placed upon
the writing to be copied. The two papers are then passed through
a rolling press, and a portion of the ink from one paper is
transferred to the other. The writing is, of course, reversed by
this process; but the paper to which it is transferred being
thin, the characters are seen through it on the other side, in
their proper position.
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