American. Russian.
No. of cubic feet per gallon... 72 104
---- ----
Hydrogen....................... 26.0 45.3
Methane........................ 41.6 22.3
Ethane......................... 12.5 13.9
Olefines....................... 14.1 11.6
Carbon monoxide................ 3.3 3.5
Carbon dioxide................. 1.7 2.3
Oxygen......................... 0.8 1.1
Nitrogen....................... Nil. Nil.
----- -----
100.0 100.0

Showing that, if the Russian oil is a little lower in illuminants, it
quite makes up by extra volume, but it seemed to me to deposit a much
larger proportion of carbon.

Taking 21/2 gallons of American naphtha, it would give roughly 180 cubic
feet of gas of the above composition, while the remaining gas would be
the ordinary water gas. Taking the analysis of this as given, and
calculating from it what would be the composition of a mixture of it
with the naphtha gas, we obtain:

Calculated. Actual.
Hydrogen...................... 47.09 42.09
Methane....................... 5.48 11.27
Olefines...................... 2.53 7.59
Ethane........................ 2.17 6.32