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An exploder approved for firing six shots simultaneously in British coal
mines. It contains a 67-1/2-V high-tension dry battery, used to charge a
150-mu F condenser, which in turn is discharged through the shotfiring
circuit by a firing key. The test circuit and an ohmmeter are incorporated
in the exploder, thc ohmmeter pointer moving over a scale to indicate
whether or not the external circuit is in order. A pushbutton disconnects
the test circuit from the external circuit and makes connection with the
firing circuit. See also: blasting machine
Source:
Dictionary of Mining, Mineral, and Related Terms
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