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13
APPENDIX. No. V.
GAS.
Ninety nine observations were made during the quarter
upon the six gases supplied by the Chartered, London and
Equitable Companies, at the Works in Horseferry-road, 73
Bessborough-street, and 78 Cambridge-street respectively.
The gases were burned in accordance with the Metropolis
Gas Act, 1860, and the illuminating power continued
above the standard light, excepting on November 6, when
the cannel gas from the London Company gave a light
equal to 19.25, instead of 20 sperm candles, and on the
20th, of the same month, the cannel gas from the Chartered
Company gave a light equal to 19.53 sperm candles.
With regard to the purity 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; but the
common gas from the London Company, presented traces
of it during the early part of October. It is gratifying to
report the absence of ammonia, so far as the Act requires,
from the common gas of the London Company during the
greater part of the quarter, which may be attributable to
the control permitted to be exercised under the Act.
The following Table gives the average light in sperm
candles of all the gases.
Chartered. London. Equitable.
Cannel 23.60 22.15 25.10
Common 14.02 14.78 15.82
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.