"(_c_) The generator must be constructed so that escape of the
evolved gas from it to the outer air is completely avoided.
"(_d_) The gasholder must be graduated in parts up to 1/4 per cent.
of its capacity, must travel easily, and be kept, as far as may be in
suspension by counterweighting.
"(_e_) The water used for decomposing the carbide and the confining
water must be saturated, before use, with acetylene, and, further, the
generator must, before the analysis proper, be put under the pressure of
the confining (or sealing) liquid."
The following is a description of a typical form of apparatus
corresponding with the foregoing requirements:
"The apparatus, shown in the annexed figure, consists of the generator A,
the washer B, and the gasholder C.
[Illustration: FIG. 22.--LARGE-SCALE APPARATUS FOR DETERMINING YIELD OF
GAS FROM CARBIDE.]
"The generator A consists of a cylindrical vessel with sloping bottom,
provided with a sludge outlet _a_, a gas exit-pipe _b_, and a
lid _b'_ fastened by screws. In the upper part ten boxes _c_
are installed for the purpose of receiving the carbide. The bottoms of
those boxes are flaps which rest through their wire projections on a
revolvable disc _d_, which is mounted on a shaft _l_.
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