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OXY-ETHER AND HYDRO-CARBON LIGHTS 95 led to the ' short circuiting ' of the oxygen-stream, and thereby caused that predominance of oxygen which had somehow, it waa evident, filled the gas-space over the tank with explosive mix- ture, instead of merely combustible vapour. At last the tank was ripped entirely open, and examined by an engineer very closely, when all was explained. In the soldering of the parti- tion which divided the safety chamber over the tank (as last de- scribed) into two, as an entering and exit chamber, a very small leak was discovered, with traces of corrosion. It is probable that this at first was absolutely imperceptible, but had gradually enlarged during the summer months ; and the re- sult was that a certain amount of oxygen passed directly to the exit chamber, without passing over the ether at all. Fro. 55.—Ether Tank, side view The remedy against this danger, as was immediately pointed out by Mr. Hardwich, was to entirely separate the two chambers as in fig. 55. With this construction, another such accident would be impossible. With regard to the soldering of the partitions in the tank, any single leak between two compartments would not have very much consequence ; and it is the sides and top of the partitions which would need special care. A little leakage at the bottom of the tank, ^hich should be the last side to put on, would have no result, since there would always be ether above that level, unless it were actually exhausted, which never ought to occur. 52. Porous Generators.—Mr. Ives constructs his gene- rators differently, filling a metal tube of two inches or more