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10
pany gave a light equal to 11.90 sperm candles, while
the Act requires the intensity of light to be not less than
12 sperm candles. Upon this circumstance being reported
to the Board, they stopped a large contract for coals then
used for making the common gas, and entered into a new
one.
With regard to the quality of the gases, they were
free from sulphuretted hydrogen, and so far free from
ammonia that they did not discolour the turmeric paper
exposed under a pressure of five-tenths of an inch of
water, exclusive of the common gas from the London
Company, which presented traces of it during the first
part of the quarter, but only very slight traces in the
month of September. The amount of sulphur in the
cannel gas from the same Company was considerably diminished,—the
result of two determinations, commenced on
September 28th, producing only 3.862 and 3.352 grains
in each 100 cubic feet of gas.
The following Table gives the average light in sprem
candles of all the gases.
Chartered. London. Equitable.
Cannel 25.09 24.58 24.78
Common 13.587 15.22 15.42
A Table and Summary were sent with each Monthly
Report on the gas to the Vestry, containing the number
of examinations with the dates, and the maximum and
minimum light, with the weekly and monthly average
illuminating power.
(Signed) C. J. B. Aldis, M.D.,
Gas Examiner.