FELT CONDITIONERS 201

The chief difference between an ordinary suction box and an Evans Rota
Belt lies in the fact that the wire, instead of having to be dragged over hard
wooden or metal box tops, passes over the soft rubber band, which is moving
at the same speed, and therefore there is a tremendous saving in the friction
and consequent wear on the under side of the wire.

The advantages of this will be quite obvious, and it is this saving in
friction which was the chief reason for the introduction of the belt in the
first place.

FIG. 79.—THE EVAKS ROTA

BEIT HT1H> UNDER A WET

FH.T. THE FIUTED AND PER-
FORATED REVOLVING Ruwret
BELT is CLEAtiv SHOWN, AISO
THE VACUUM GAUGES TO THE
SUCTION BOXES

It seems that this belt will now stand up well to the severe conditions of
modern paper machines, and that it may soon have universal application both
on felts and wires.
When passing through the first press, the paper, being very moist, takes
the impression of the cross-meshes of the felt fabric. In Drawing Cartridge
this is called the 'tooth' aad is a distinctive feature required and expected by
artists and draughtsmen. Coarse inesh felts, specially made for the production
of various varieties of tooth, may be obtained from felt-makers, and this paper
is made in imitation of 'hand-made drawing'. For 'fine' papers, such as
writings, banks, ledgers, etc., and body paper for coating and printing, tbe fe&
marking is very undesirable, as it prevents a close finish being obtained.