ng current motor mining pump minute, and each bucket of the chain pump makes 4.8 speed induction motors of the polyphase type have in the underground installation at Germania I. mine journeys up and down per minute. The breadth of done remarkably well in this service. of the Gelsenkirchener… … ated by electric power. Large numbers of A JAEGER ELECTRIC ROTARY PUMP. BY FRANK C. PERKINS. electric hoists, pumps, cutters, and auxiliary The drainage of mines by electrically op- mining machinery have been supplied by Ernest Scott erated pumps has now reached a stage of reliability consists of a…
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