Fifty grammes (or say
2 oz.) of the pulverised carbide are then weighed into the flask _c_
and this is connected by the flexible tubing with the vessel _b_.
The carbide is then decomposed by bringing it in small portions at a time
into the bulb _b_ by raising the flask _c_, and letting it drop
from _b_ into the generating vessel _a_, after having opened
the cock _e_ and slightly raised the vessel _f_. After the last
of the carbide has been introduced two hours are allowed to elapse, and
the volume of gas in _f_ is then read while the water stands at the
same level in _f_ and _g_, the temperature and pressure being
noted simultaneously."
A second, but less commendable method of decomposing the carbide is by
putting it in a dry two-necked bottle, one neck of which is connected
with _e_, and dropping water very slowly from a tap-funnel, which
enters the other neck, on to the carbide. The generating bottle should be
stood in water, in order to keep it cool, and the water should be dropped
in at the rate of about 50 c.c. in one hour. It will take about three
hours completely to gasify the 50 grammes of carbide under these
conditions. The gas is measured as before.
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