Dry. Saturated.
0 deg. C. & 760 mm. 60 deg. F & 30 ins. 60 deg. F. & 30 ins.
1 gramme 12.14 cals. 12.14 cals. 12.0 cals.
1 litre 14.l9 " 13.45 " 13.22 "
1 cubic foot 40.19 " 380.8 " 374.4 "
The figures in the last column refer to the dry acetylene in the gas, no
correction having been made for the heat absorbed by the water vapour
present. As will appear in Chapter X., the average of actual
determinations of the calorific value of ordinary acetylene is 363 large
calories or 1440 B.Th.U. per cubic foot. The temperature of ignition of
acetylene has been generally stated to be about 480 deg. C. V. Meyer and
Muench in 1893 found that a mixture of acetylene and oxygen ignited
between 509 deg. and 515 deg. C. Recent (1909) investigations by H. B. Dixon
and H. F. Coward show, however, that the ignition temperature in neat oxygen
is between 416 deg. and 440 deg. (mean 428 deg. C.) and in air between
406 deg. and 440 deg., with a mean of 429 deg. C. The corresponding mean
temperature of ignition found by the same investigators for other gases are:
hydrogen, 585 deg.
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