International Library of Technology · Scranton, International Textbook Co. · leaf 114
oor contact with the metallic frame. 2. An adjustable spring pressure must be provided, inorder to keep the carbons down to the commutator with justenough pressure to prevent cutting of the surface whilemaintaining good contact. 3. The brushes must be capable of being raised and heldclear of the… … Fig. 1378. with nearly all forms. The brush holder shown in Fig.1378 is a fair specimen, but we will suggest, as useful exer--vise for the student, that he design one himself, and try to 2490 DYNAMO-ELECTRIC MACHINE DESIGN. embody in it all the points mentioned above, and, in addi-tion, perhaps a…
Electrical engineering
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