The hopper-shaped reservoir is supported by two pivots, and has a
slight rocking or vibrating motion imparted to it by each lifting of
the lever. This prevents the earth from becoming clogged, and insures
its regular delivery.
[Illustration: Fig. 68 THE "PULL-UP" APPARATUS.]
The construction is more clearly shown in Fig. 68.
In this figure, A is the vibrating hopper for holding the earth. Its
capacity may be increased to any desired extent by building above it
a straight-sized box of any height. It is not unusual, in fixed privies,
to make this reservoir large enough to hold a supply for several months.
As the earth is dry, there is no occasion for the use of any thing
better than common pine boards in making this addition to the reservoir.
B is one side of the wooden, frame by which the hopper is supported
and it may be made of one inch pine or spruce.
C is a box of lacquered or galvanized iron, without either top or
bottom. It moves on two pivots, one of winch is shown on its exposed
side. In its present position, its upper end opens into the hopper,
and its lower end is dosed by the stationary board over which it stands.
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