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Acid 7 lbs. The Acid was diluted with four times its bulk of
water. The hydrocyanic acid gas was generated in jars, each jar containing 2 lbs of Cyanide and 24 pints of the diluted
Acid. Two jars were placed in each of three manholes.
One hour was allowed for the generation and
spread of the gas, the sewer afterwards being flushed with wa-
ter to ensure the spread of gas and to carry down dead rats.
Test paper showed the presence of gas after being flushed
with water. The percentage of poisonous gas in this test was
about 12%.
Experiment II.
Material used; - Potassium Cyanide 20 lbs, Sulphurie Acid
14 lbs. The Acid was diluted and gas generated as in Exp.I.
In this case five manholes were used, three: containing
two
generating jars with 2 lbs of Cyanide in each; the remaining two contained one and three jars respectively, these jars hold-
ing as before 21bs Cyanide. The experiment was carried out
in a similar manner as before. The percentage of poisonous
gas was about 10%.
I have etc,
(Sd.)Richard.F. Drury,
Sanitary Surveyor.
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