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4
testing station by the Imperial Company, as tested by the requirements
of the Metropolis Gas Act, 1860, was 14.7 standard sperm
candles. The maximum illuminating power noted was 16.1, and
the minimum 130 candles.
The average illuminating power was 03 candle above that of the
preceding year.
Ammonia was always present in the Gas, though never in excess.
Sulphuretted hydrogen was never detected.
Sulphur was present in amounts ranging from 11.71 to 30.46
grains per 100 cubio feet, the average being 22.42 grains.
I have the honor to be, Gentlemen,
Your obedient Servant,
THOS. STEVENSON, M.D.,
Medical Officer of Health and
Examine of Gas.
Sanitary Department,
10, Edward Street, Hampstead Road, n.w.
June 5th, 1874.