It is not well to have movable handles on the rollers, because then they are likely to roll over the stone too lightly and it is not within one's power to lay on the ink thoroughly. To prevent blistering the hands, thick leather covers may be used. Then it is possible to use any desired pressure.
Paper presses are needed both to obtain a uniform dampening of the paper as also to restore the proper flatness to the printed paper. Models are to be seen at the shops of all book-printers and binders.
[CHAPTER V]
CONCERNING PAPER
Three kinds of paper are used mainly in lithography. They are:—
(a) the transparent, oiled or varnished paper;
(b) underlay or waste paper; and
(c) the printing-paper.
I
TRANSPARENT PAPER, AND THE TRANSFER OF OUTLINES TO THE STONE
Oiled paper is used for tracing a drawing accurately and then transferring it to the stone either by transferring or by re-tracing it on the stone. It must have the following properties:—
(1) It must not smut the original drawing on which it is laid. Consequently it must be absolutely dry.