it from 16 to 17.5 candle power. When this is done by cannel, the cost
is 2.6 pence per candle power, so that the extra 11/2 would cost 4d. per
1,000.

Carbureting by the vapors of gasoline by the Maxim-Clarke process
costs 13/4d. per 1,000, so that the extra candle power would mean an
expenditure of 2.62 d. Unfortunately I have no figures upon which to
calculate the cost of producing such a gas by the Dinsmore process,
but with the three important water gas enrichers we can deal.

Using Russian fuel oil, which can be obtained in bulk in London at 3d.
per gallon, the proprietors of the Springer plant guarantee 51/2 candle
power per 1,000 cubic feet of gas per gallon used, so that, to produce
a 22 candle gas, 4 gallons would be used. The cost per 1,000 cubic
feet may be roughly tabulated, as the coke used amounts to about 40
lb.

s. d.
Oil.................................... 1 0
Coke................................... 0 3
Labor and purification................. 0 2
Charge on plant........................ 0 1
----
1 6

Twenty five per cent. of 12-candle gas when mixed with 75 per cent. of
the 16-candle gas gives the required 17.5 candle gas, which would
therefore cost 1s. 11/2d., or the enrichment would have cost 11/2d.

By the Lowe process, an increase of 5.3-candle power is guaranteed for