Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 325
Fig. 329—Showing How to Find a Grounded ArmatureCoil. … Fig. 330—Locating an Open Circuit or Short-Circuitin Armature Coils. LOCATION OF TROUBLES 315 The remedy in either case is obvious. The brushes should be cleaned from time to timewith a fine grade of sand paper. EMERY PAPER should in all cases be avoided. If the commutator is very rough and cannot…
Telegraph, Wireless
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