The quadrant bears at
both extremities against the flat bar (29) when the bell (22) is
sufficiently raised. The bar (29) extends above the bell and carries an
arm (30) on which is a finger (30_a_). There is fixed on the shaft
(18) a wheel (31), with diagonal divisions or ways extending from side to
side of its rim, and stop-pins (32) on one side at each division. A
clutch prevents the rotation of the wheel during winding up.
[Illustration: FIG. 46.--THE "A" GENERATOR OF FRED K. BRABY AND CO.,
LTD.]
(2) Automatic; water-to-carbide; contact, superposed trays.
The type "B" generator made by this firm comprises an equalising bell
gasholder, a crescent-shaped feed water-tank placed on one side of the
gasholder, and mechanism for controlling a tap on the pipe by which the
feed water passes to a washer whence it overflows through a seal into a
horizontal generating chamber containing cells packed with carbide. The
mechanism controlling the water feed embodies the curved bar (25),
connecting-rod (27) and flat guide-bar (29) as used for controlling the
carbide feed in the "A" type of generator (Fig. 46). When the bell
descends water is fed into the washer, and the water-level of the seal is
thus automatically maintained.
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