DEVICES TO SECURE AUTOMATIC ACTION,--The devices which are commonly
employed to render a generator automatic in action, that is to say, to
control the supply of one of the two substances required in the
intermittent evolution of gas, may be divided into two broad classes: (A)
those dependent upon the position of a rising-holder bell, and (B) those
dependent upon the gas pressure inside the apparatus. As the bell of a
rising holder descends in proportion as its gaseous contents are
exhausted, it may (A^1) be fitted with some laterally projecting pin
which, arrived at a certain position, actuates a series of rods or
levers, and either opens a cock on the water-supply pipe or releases a
mechanical carbide-feed gear, the said cock being closed again or the
feed-gear thrown out of action when the pin, rising with the bell, once
more passes a certain position, this time in its upward path. Secondly
(A^2), the bell may be made to carry a perforated receptacle containing
carbide, which is dipped into the water of the holder tank each time the
bell falls, and is lifted out of the water when it rises again. Thirdly
(A^3), by fitting inside the upper part of the bell a false interior,
conical in shape, the descent of the bell may cause the level of the
water in the holder tank to rise until it is above some lateral aperture
through which the liquid may escape into a carbide container placed
elsewhere.
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