. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. f the generating dynamo, and as thepressure was constant the speed was also invariable. ^rhis is the ELECTRIC BLASTING. 513 simplest form of installation and gives little trouble and requires butlittle attention, especially if accumulators are not required. I have not referred to alternating current high tension dynamos,partly because my own experience with them is limited and also becausewith the exception of installation on a large scale, where the presenceof a properly quali
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. f the generating dynamo, and as thepressure was constant the speed was also invariable. ^rhis is the ELECTRIC BLASTING. 513 simplest form of installation and gives little trouble and requires butlittle attention, especially if accumulators are not required. I have not referred to alternating current high tension dynamos,partly because my own experience with them is limited and also becausewith the exception of installation on a large scale, where the presenceof a properly qualified electrical engineer would be required, the ordinarymining man will rarely have to do with them. Electric Blasting.—The simultaneous discharge of a large numberof holes is far more effective for the breaking down of rock, whetherin tunnelling or quarrying, than is the result from the same numberof holes fired separately. The best and safest way of attaining this isby the use of electricity, and the machine usually employed for generatingthe electric current is a portable arrangement of a small hand
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