CO129-418 - Public Offices & Others - 1914 — Page 458

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The room must be properly closed by pasting up doors, windows, fireplace, etc.

*The advantages claimed for the machine are:- (1) The heat from the combustion of the sulphur is

not set free in the room and, consequently, damage due to condensation of water vapour is eliminated e.g. discoloration.

(2) The room can be charged with gas for as long as

desired at a given strength.

(3) Certain types of machines (e.g., A.& B) can be

employed for extinguishing fires in closed com- partmente, e.g., ship-holds. Txperiments were carried out for the Local Government Board in 1905-6 by Mr. J. "ade to determine the efficiency of Clayton gas in disinfecting cargo in the holde of ships.

"The gas evolved appears to consist mainly of the

residual nitrogen of the air and a small amount of

unconsumed oxygen with sulphurous acid in varying

amounts up to 15 per cent and a considerable amount

of sulphuric acid in suspension, the presence of

which makes the mixture white and opaque.

102 Rats

"In various experiments in ships, it has been found that when the hold was empty, Plague and Cholera germs

were destroyed after a few hours' exposure to an atmosphere containing about 5 per cent of were readily killed in two hours, so also fleas and cockroaches with a uniform diffusion of not more than 0.5 per cent of 502 through the hold of the ship. The duration of exposure proved to be of more import- ance than the degree of concentration of the gas............

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