[Illustration: FIG. 58.--"SIGNAL-ARM" GENERATING PLANT.]
_Maker_: ST. JAMES' ILLUMINATING CO., LTD., 3 VICTORIA STREET,
LONDON, S.W.
_Type_: (1) Automatic; water-to-carbide; contact, superposed trays.
This plant consists of the generators _A_, the washer _B_, the
equalising gasholder _C_, the purifier _D_, and the water-tank
_E_. The carbide is arranged in baskets in the generators to which
water is supplied from the cistern _E_ through the pipe _F_.
The supply is controlled by means of the valve _H_, which is
actuated through the rod _G_ by the rise and fall of the gasholder
_C_. Gas travels from the gasholder through the purifier _D_ to
the service-pipe. The purifier is packed with heratol resting on a layer
of pumice. The washer _B_ contains a grid, the object of which is to
distribute the stream of gas through the water. There is a syphon-pot
_J_ for the reception of condensed moisture. Taps _K_ are
provided for shutting off the supply of water from the generators during;
recharging, and there is an overflow connexion _L_ for conveying the
water to the second generator as soon as the first is exhausted. There is
a sludge-cock _M_ at the base of each generator.
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