Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 720
contact spring F must be stiff enough to insurea good contact. If the brush does not make an even contact on the contact-disk, it can be remedied by placing a piece of emery cloth on the contact-disk and revolving the brush over the rough side of the emery cloth byhand. G. The carbon brushes must… … Fig. 5. This absolute zero can be obtained by loosening the set screw (marked C)on the end of index lever D. The contact disk, G, can then be rotatedon the shaft until the voltmeter reading is at zero, with index pointer seton zero degrees. In case the maximum deflection is too low, it can be…
Electrical engineering
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