84 MODERN PAPER-MAKING

The stuff is discharged from the roll down on to a conical hood fixed at
the top and inside the tower. This spreads out the pulp and mixes it con-
tinuously during the whole of the beating. The bottom of the tower tapers
down to a bend, at the end of which is fixed the circulating pump, which
throws the stuff up a pipe and discharges it again in front of the roll.

The beating is performed in the same way as in the Taylor beater, and the
same remarks apply as to the roll and emptying of the stuff.

The pump circulator of the Taylor and Tower beaters is a great help with
short-fibred furnishes such as esparto, since it materially helps Vetting*,
and in fact the roll can be lifted quite clear and the circulation by the pump
will induce quite a large degree of wetness. Furthermore, the beaters may

[Messrs. Bertrams Ltd.

FIG. 25.—SOENNES HOLLANDER BEATER, SHCTWLNG THREE BED-PLATES PLACED UP THE BACKFALL, ALSO EQUALLY SPACED
BARS ON ROLL, AND VERY HIGH BACKFALL
The path of travel of the stuff is clearly shown, also the unusual shape of the wooden cover. Note the haffle plate in
front of die roll, to prevent the roll from splashing in the stuff before it reaches the pkte
be filled with stuff of comparatively high consistency, and this is a great help
in beating esparto furnishes to a given length and wetness. Unless a Tower
beater is filled to a point below the conical hood lodgers' will collect above
and cause trouble.
The Sciennes patent beating engine, evolved after careful thought and
trial by Samuel Milne, is a great advance in beater design, and is giving good
results on a wide variety of furnishes. Of the hollander type, it Jias several
modifications of the usual standard models, and some innovations (see Figs.
25 and 26).
The trough itself is extremely well designed, in order to promote rapid and
even -circulation, and it is not the usual '2 semicircles joined by 2 sides', in
which a great deal of stuff either lodges permanently until moved on by the