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32
house in Mount Street, at sundry times during the month of
August 1858, was uniformly free from sulphuretted hydrogen,
but contained traces of ammonia.
Its illuminating power was such, that a batswing burner,
consuming 2½ cubic feet per hour, gave a light equal on the
average to that of 13¼ sperm candles, burning at the rate of
120 grains per hour.
The Cannel Gas supplied by the London Gas Light
Company was also entirely free from sulphuretted hydrogen,
but contained slight traces of ammonia and carbonic acid.
A course of experiments, from May 21st, on the illuminating
power, with a batswing burner, consuming 2½ cubic
feet per hour, gave an average light equal to 10.9 sperm
candles, burning at the rate of 120 grains per hour.—
September 7th, 1858.
III. The result of observations, continued during the
month of September and up to 19th October, shows that the
Cannel Gas, supplied by the Chartered Company, was absolutely
free from sulphuretted hydrogen, and that a batswing
burner, consuming 2½ cubic feet per hour, gave a light equal
on the average to that of 15 7/10 sperm candles, burning 120
grains per hour.
The Cannel Gas supplied by the London Company, from
September 8th to October 15th, was also perfectly free from
sulphuretted hydrogen, and a batswing burner, consuming 2½
cubic feet per hour, gave an average light of 10.3 sperm
candles, burning 120 grains per hour.