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15
London, and Equitable Companies, at No. 40, Parliamentstreet,
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 required by the Act.
With respect to purity, all the gases were free from
sulphuretted hydrogen, and so far free from ammonia, that
they did not discolour the turmeric paper, except on
April 17th, 25th, May 17th, 23rd, June 8th, 26th, July 5th,
and October 24th, 1867 ; and on March 6th, 13th, 18th,
1868, when the common gas of the London Company, and
on March 17th, 1868, when the cannel gas of the Equitable
Company, presented traces of ammonia.
The following Table gives the average light in sperm
candles of all the gases :—
Chartered. London. Equitable.
Cannel 21.77 23.52 24.85
Common 13.09 14.68 14.13
A Table and Summary were sent with each Monthly
Report on the Gas to the Vestry, containing the number of
examinations and the pressures, with the dates, and the
weekly and monthly average illuminating power.
I remain,
My Lords and Gentlemen,
Your faithful Servant,
C. J. B. ALDIS, M.D.
Medical Officer of Health
and Gas Examiner-
>
June 4thy 1868.