Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/49

Rh placed to every folded letter-press leaf, by inserting the one within the other, a folded writing paper being left outside every other section, and all being put level with the head; the whole book should then be well pressed.

If by any chance there should be one sheet in duplicate and another missing, by returning the one to the publisher of the book the missing sheet is generally replaced; this, of course, has reference only to books of a recent date.

There is a new press of American invention that has come under my notice. It will be seen that it acts on an entirely new principle, having two horizontal screws instead of one perpendicular. The power is first applied by hand and finally by a lever and ratchet-wheel in the centre. A pressure guagegauge [sic] is affixed to each press, so that the actual power exerted may be ascertained as the operation proceeds. The press can be had from Messrs. Ladd and Co., 116, Queen Victoria Street, E.C.; and they claim that it gives a pressure equal to the hydraulic press, without any of the hydraulic complications.