Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 249
Fig. 149. … Fig. 150. 238 DYNAMO ELECTRIC MACHINERY. sometimes provided with gridiron covers and gauze to givebetter protection against dirt. The costs per hour of operating machine tools driven byindividual motors are given in the following table, the datarepresenting conditions such as obtain in large…
Electric machinery
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