ad, and it is be- brass balls. tween these plates that the measuring is done, and The two upper balls, which are in metallic connec- Fig. 2.—ROTARY ELECTRIC MOTOR. tion with each other, are supported above against them that the ends of the ‘ points” the walking beam upon four perpendicular rest. A… … ing rod and crank disk. holes in the straps engage these notches Since the attractive and repulsive foree of and loek the straps. The upper ends of static electricity is far from powerful, it is essential that the bolts are pivoted to spring-pressed thumb-levers machinery operated by it should be…
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