Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 249
e, to takecare of the difference in the character of the current. SPEED Speed Counter. Speed is usually measured by the well-knownspeed counter. Fig. 81, consisting of a small spindle which turns awheel one tooth each time it revolves. The point of the spindle is 219 98 MANAGEMENT OF… … Fig. SI. Typical Speed Counter Tachometer. Another instrument for testing the number ofrevolutions per minute is the tachometer. The stationary form of this instrument is shown in Fig.82. It must be belted by a string,tape, or light leather belt to themachine, the speed of which is tobe tested. If…
Electrical engineering
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