896 
Production of gas (i liters). 
Weight of ] ela ot 
eight o Actua yield o 
coal in — of | Air in gas.| yield of gas per 
grams. =. gas, lo of 
coal, 
48.714 10. 018 0. 058 9. 960 227. 845 
Analysis of gas. 
Heavy |: Carbon ; 3 
—— hydro- Oxygen monox- | Methane ig Nitrogen 
(COo) carbons (Og). ide (CH,). (Ha). (Ne). 
43 (Cy, Hen). (CO). 
Analysis of gas as ob- 
tained (per cent) -_-_-_- 6,2 6.3 0, 85 5.0 41.8 87.1 2.65 
Calculated analysis of gas : : 
as produced 6. 24 6.34 0.73 5. 03 42.05 87,34 2.37 
Calories per liter. 
Calorific value of the gas as obtained _____-_-_.----_----~-- 5, 583 
Calorific value of the gas as produced______-----_-----_- sk 5, 616 
The gas which supplies the Bureau of Science is not made from coal, 
but from a mixture of equal parts of petroleum and crude oil. For some 
time a mixture of petroleum and “Cape Axle Oil” has been used for this 
purpose. Coconut oil in the place of “Cape Axle Oil” was formerly 
found satisfactory. The oil is gasified by dropping under considerable 
pressure into a retort heated to a bright cherry-red heat. The gas pro- 
duced in this way burns with a long, smoky flame in spite of the fact that 
it is mixed with 30 per cent of air at the generator. This gas would make 
a splendid enricher for others which are deficient in illuminating power. 
An analysis of a sample taken from the tap on July 26, 1906, gave results 
showing a wide difference between it and coal gas as follows: 
Analysis of laboratory supply. 
Heavy Carbon 
R yet hydro- | Oxygen | monox- | Methane a. Nitrogen 
Oo). carbons (Og). ide (CH,). (No); 
(C 2) (C, Hon). (CO). ( 2). 
Per cent. | Per cent. | Per cent. | Per cent, | Per cent.| Per cent.| Per cent. 
1.00 24.9 5.9 0.8 35,1 G1. 29.2 
Calorific value of the gas, 7,705! calories per liter. 
No calorimetric determinations of the gases could be made, but a table 
which shows their comparative heat values is given below. The combus- 
"This number becomes 8,020 when the value used in the caleulation of the 
heavy hydrocarbons is that given by Payne, H. L., J. Anal. and App. Chem. 
(1893), 7, 233, when the “illuminants” are derived chiefly from the decomposi- 
tion of mineral oil. 
