The substance of
the directions issued by the German Association (_Der Deutsche
Acetylenverein_) is reproduced below.
"METHODS FOR THE DETERMINATION OF TILE YIELD OF GAS FROM CALCIUM CARBIDE.
"The greatest precision is attained when the whole of the sample
submitted to the analyst is gasified in a carbide-to-water apparatus, and
the gas evolved is measured in an accurately graduated gasholder.
"The apparatus used for this analysis must not only admit of all the
precautionary rules of gas-analytical work being observed, but must also
fulfil certain other experimental conditions incidental to the nature of
the analysis.
"(_a_) The apparatus must be provided with an accurate thermometer
to show the temperature of the confining water, and with a pressure
gauge, which is in communication with the gasholder.
"(_b_) The generator must either be provided with a gasholder which
is capable of receiving the quantity of gas evolved from the whole amount
of carbide, or the apparatus must be so constructed that it becomes
possible with a gasholder which in not too large (up to 200 litres = say
7 cubic feet capacity) to gasify a larger amount of carbide.
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