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18
Gas.
One hundred and ninety observations were made during
the year upon the four gases supplied by the London and
Equitable Companies, at No. 73, Bessborough-street, and
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, except on August
18th, 1869, when the cannel gas of the London Company,
and on January 18th, 1870, when the common gas of the
London Company burnt at the rate of only 4*5 feet per hour,
on account of defects in the meter.
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 August
18th, October 12th, 1869, and January 18th, 1870, when
the common gas of the London Company presented slight
traces of ammonia.
On November 8th, 1869, I tested some fish-tail burners
supplied by the London Gas Company to the street lamps in
Belgravia, and found that they passed the stipulated quantity
of gas.

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.,
May 5th, 1870. Medical Officer of Health.