C. Fraenkel has carried out some
experiments upon the temperature of the acetylene immediately after
evolution in a water-to-carbide apparatus containing the carbide in a
subdivided receptacle, using an apparatus now frequently described as
belonging to the "drawer" system of construction. When a quantity of
about 7 lb. of carbide was distributed between 7 different cells of the
receptacle, each cell of which had a capacity of 25 fluid oz., and the
apparatus was caused to develop acetylene at the rate of 7 cubic feet per
hour, maximum thermometers placed immediately over the carbide in the
different cells gave readings of from 70 deg. to 90 deg. C., the average
maximum temperature being about 80 deg. C. Hence the Austrian code of
rules issued in 1905 governing the construction of acetylene apparatus
contains a clause to the effect that the temperature in the gas space of
a generator must never exceed 80 deg. C.; whereas the corresponding
Italian code contains a similar stipulation, but quotes the maximum
temperature as 100 deg. C. (_vide_ Chapter IV.).
It is now necessary to see why the production of an excessively high
temperature in an acetylene generator has to be avoided.
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