104. Register printing. It is sometimes thought necessary to
print from a wooden block, or stereotype plate, the same pattern
reversed upon the opposite side of the paper. The effect of this,
which is technically called Register printing, is to make it
appear as if the ink had penetrated through the paper, and
rendered the pattern visible on the other side. If the subject
chosen contains many fine lines, it seems at first sight
extremely difficult to effect so exact a super position of the
two patterns, on opposite sides of the same piece of paper, that
it shall be impossible to detect the slightest deviation; yet the
process is extremely simple. The block which gives the impression
is always accurately brought down to the same place by means of a
hinge; this spot is covered by a piece of thin leather stretched
over it; the block is now inked, and being brought down to its
place, gives an impression of the pattern to the leather: it is
then turned back; and being inked a second time, the paper
intended to be printed is placed upon the leather, when the block
again descending, the upper surface of the paper is printed from
the block, and its undersurface takes up the impression from the
leather.
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