ELECTRICAL APPARATUS. 



287 



Electrical Wheel. (Fig. Fi - 3:4 ' 



324.) This arrangement 

 is mounted on a wooden 

 base, having at each end a 

 glass pillar with a ball at 

 the top, supporting pointed 

 wires, which are fastened 

 towards each other, and 

 about four inches apart, 



in the centre of which a very light vertical wheel, with 

 floats on the edge, is supported by a suitable stand. Upon 

 connecting the wires with the electrical machine, the one 

 with the positive conductor, and the other with the negative 

 conductor, and putting it in motion, the wheel will turn 

 from the positive to the negative side. Price, $5.00. 



Electrical Saw Mill. (Fig. 325.) Fi *' 325 



The electrical saw mill represented in 

 the cut, consists of two brass pillars, 

 supported on a mahogany base ; from 

 near the centre of the glass pillars 

 there is supported an axle, with six or 

 eight glass spokes, each terminated 

 with a metallic ball ; this revolves 

 easily just over a large brass ball at- 

 tached to the base. On each of the 

 pivots of the axle there is a crank, 

 turned in opposite directions, with rod 

 attached to each ; these alternately 

 draw up and down light frames repre- 

 senting saws, which are movable in a 

 framework supported on top of the 

 lass supports ; another large brass 



ll being supported from the framework. 



To use, connect the upper brass ball with the prime con- 

 ductor, and the lower ball with the table, or ground ; on 

 exciting the conductor, the nearest ball on the wheel will be 

 attracted by a large ball connected with the conductor, and 

 on being fully charged will be repelled by it, and thus bring 

 the next ball near, which in turn will be repelled ; these, in 

 coming near the lower ball, will be attracted and discharged ; 

 thus a constant carrying of electricity from the upper to the 

 lower ball will take place, and a rotary motion in the wheel 



gl 

 ba 



