having an illuminating power of twenty-two candles, can be made with
an expenditure of 28 to 32 lb. of coke and 21/2 gallons of petroleum.
The most important factors, i.e., the quantity of petroleum and the
illuminating value of the gas, have also been checked and corroborated
by Mr. Heisch and Mr. Leicester Greville.

Total gas made = 8,700 cubic feet.

Time taken: Blowing. 1 hour.
Time taken: Making. 50 minutes.

Fuel used: Gas coke. 270 lb. = 31 lb. per 1,000 c.f.
Fuel used: Naphtha, sp. gr. 0.709. 34 gals. = 2.7 gals. per 1,000 c.f.

Illuminating power of gas = 21.9 candles.

I must admit that these results far exceeded my expectations, although
they only confirmed the figures claimed by the patentee; and there are
not wanting indications that, when worked on a large scale and
continuously, they might be even still further lowered, as it is
impossible to obtain the most economical results when making less than
10,000 cubic feet of the gas, as the proper temperature of the walls
of the generator are not obtained until after several makes; and it is
only after about 8,000 cubic feet of gas has been made that the best
conditions are fulfilled.

It will enable a sounder judgment to be formed of the working of the
process if the complete experimental figures for a make of gas be
taken.