58 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



Fig. 479. 



a continuous circuit, and joined together, the ends of the 

 coil being soldered to the opposite sides of a break-piece on 

 the spindle, which is formed of two segments of a silver 

 cylinder, fastened to a ferule of ivory on the spindle, and 

 separated from contact with each other by a small space. 

 To the spindle is fastened a pulley, connected by a catgut 

 band with the wheel above, by the turning of which each 

 pole of the armature may be brought, in rapid succession, 

 opposite each pole of the magnet, and as near as possible 

 without touching. Two silver springs press against the op- 

 posite sides of the break-piece, and are connected below the 

 base by wires soldered to the cups with binding screws on 

 the base. With this arrangement, water may readily be 

 decomposed, and for strong shocks, a break is attached to 

 the spindle, against which a spring presses, supported by a 

 pillar, and at the base connected with one of the silver 

 springs of the break-piece. Price, $25.00 and $35.00. 



Improved Magneto- Electric Machine in Box Motion by 

 Toothed Wheel. (Fig. 480, next page.) In this arrangement 

 the magnets are supported beneath a mahogany board, in a 

 horizontal position, by three brass pillars, the armatures re- 

 volving over the poles, and motion being given to them by 



