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17
APPENDIX. No. V.
GAS.
Seventy-two observations were made during the quarter,
upon the six gases supplied by the Chartered, London, and
Equitable Companies,in the Horseferry-road,73,Bessboroughstreet,
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 August 12th,
when both the gases supplied by the Chartered Company
presented traces of ammonia, which were attributed by the
late engineer to the foul state of the meters, caused by the
passing through them of impure gas, made from wood the
day before while making experiments.

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.
C. J. B. ALDIS, M.D.,
Gas Examiner.