SJ88 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



be produced, which, by means of the cranks and rods, will 

 move the saws up and down. Price, $0.00. 



Fig. 326. 



Rotating Bell Glass. (Fig. 326.) To a mahogany base is 

 supported two uprights, one of metal and the other of glass, 

 each having a brass cap and socket, with sliding rod, the 

 outer ends of the rods being formed into hooks. Between 

 the inner ends of these rods there is supported on a point, 

 and metal centre, a bell glass, having pieces of tin foil pasted 

 on its sides. A chain, connecting the insulated rod with the 

 prime conductor of an electrical machine, will cause the rod, 

 and glass covered by one of the strips nearest to the rod, to 

 be electrified, and consequently to be repelled ; thus bring- 

 ing another portion near the rod, which in like manner is 

 charged, and repelled ; and tlius each portion will be charged 

 in succession ; each of which, in revolving near the rod con- 

 nected with the ground, will be discharged, and thus a con- 

 tinued rotary motion produced. Price, $4.00. 



Electrical Vane. (Fig. 327.) This is a light wheel of 

 paper or pasteboard, suspended on a stand by a delicate 

 point, having a support to sustain it in a horizontal plane ; 

 on the edge of the wheel are a number of floats, which 

 when placed before the end of a point attached to the 

 prime conductor, will be put into rapid rotary motion. 



The wheel may be suspended vertically, instead of hori- 

 zontally, and a system of wheelwork put in motion by the 

 same means. Price, $2.00. 



