r The valve itself was controlled from the surface by pumped out and filled with air. its high voltage, small weight, and compactness. The means of acord. The difficulty experienced in operat- Would it not bea far simpler plan, asks a writer in La battery is of the zinc-lead type, the zinc being… … passes through the cunductors, the plati- num is heated to incandescence and dis- Fig. 2. charges the powder. Any other electric detonator can be used, but the cartridge described possesses the inerit of simplicity. A battery of accumulators or of Leclanché eells is employed to explode a series of…
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