WATER-MARKING

239

names will be spaced about 17! inches apart; this will allow for a stretch of
about £ to f inch down the machine and a shrinkage of about f inch across
the machine for each sheet.

Figs. 97 to 100 show the positions of the water-marks in a sheet of writing
paper.

Unless these matters are carefully attended to and the 'draws' carefully
regulated, a great deal of broke will be made at the cutters, on account of the
name or design not appearing at the correct and regular interval in the finished
sheet. With papers for postage stamps and currency notes, where the water-
marks have to register exactly and correspond minutely with intricate printings

ff

CO

Green, So* and Wate
ftc. 100.—PosmoN OP MASK IN STAGGERED QUASTQ SHEET
and perforating, special cutting marks are placed on the dandy roll, and the
distances between these most be frequently checked by the machineman, at
least after each beater is emptied, in order that any slight variation may at
once be rectified by altering the draws or 'hanging* or lowering the
dandy.
If the marks are coming too close, the dandy may be 'hung' or raised a
little by lifting the brackets so that it drags on the stuff, or if die marks are
too far apart the roll may be let down into close contact with the stuff. The
roll is driven round entirely by the friction of the stuff, so that the amou&t
of impetus given to it may be varied by the two methods mentioned* A