h 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 Bergwerks-Aktiengesellschaft, road sprinkled is… … ated by electric power. Large numbers of 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 160 horse power Drehstron…
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