228

MODERN PAPER-MAKING

clearly water-marked paper can be made. The best situation for the steam-
pipe is in the top-level water box. A stronger paper may be made from heated
stuff than from the same stuff run cold.

The Dandy Roll and its Use,—The body of a dandy roll is a brass tube on

[Green, Son and IVaite
FIG. 93 .-LAID ROLL, ORDINARY JOURNAL TYPE

which are fixed a number of brass discs and a framework of cross-wires. A
cylinder of wire cloth similar in mesh to a machine wire is pulled over the
body and fixed at the ends. This is called a 'wove' roll (Fig. 92). The
centre tube is extended as spindles, which ran in the bushes of adjustable

[Green, Son and Waite
FIG. 94.—WOVB DANDY R.OLL, HOLLOW TYPE

brackets fixed at eadb side of the machine, between the first and second sucdon
boxes or in a position forad most suitable. A laid' roll (Fig. 93), instead of
having a woven cover, has one made from parallel wires. These are kept
apart and m position by twisted wires round the circumference, from } to