aving balls. At the opposite sides of the instrument and very near to the revolving balls are placed two larger balls in charge of the work and have been constructed in novelty of design is always a welcome acquisition. The experiments possible with a six or eight plate the gun factory. of polished… … 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 scale plate, which is 674…
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