ELE.CTRICAL MACHINES AND APPARATUS. 19 



No. 



395 Fig. 271, Nairne's cylinder electrical machine, 

 with positive and negative conductors, ja- 

 panned in imitation of brass, and mounted 

 on glass pillars. Cylinder, 8 in. diameter, $ 22.00 

 " * 9 in. " 25.00 



" 10 in. " 28.00 



296 Fig. 272, cylinder electrical machine with 

 highly finished japanned conductor. 



Cylinder, 5 in. diameter, 10.00 



12.00 



6 in. 



7 in. 



8 in. 



9 in. 

 10 in. 



14.00 

 16.00 

 18.00 

 22.00 



397 Fig. 273, small cylinder electrical machines. 



4 in. diameter, 8.00 



5 in. " 10.00 



6 in.' " 12.00 



398 Fig. 274, electrophorus with metal plate, 



$3.50 to 6.00 



399 Fig. 275, electrical insulated stool with ma- 



hogany top, - - $3 to 6.00 

 400 Fig. 275, electrical stool, with brass sockets 



to unscrew, - - 4.50 

 - 401 Fig. 276, Leyden jar, superior finish, pint $1, 



to $1.25 ; quart, $1.25 ; half gallon, $1.75 ; 



gallon, - $2.50 

 402 Fig. 277, discharger, with glass handle, - 1.25 



403 Fig. 277, discharger, jointed, with glass 



handle, - - $2 to 4.00 



404 Fig. 278, pith ball electrometer, 0.50 



405 Fig. 279, " " 0*50 



406 Fig. 280, balance electrometer, - . , , 1.00 



407 Fig. 281, quadrant electrometer, boxwood 



scale, $1.25 ; ivory, 1.50 

 ^ 408 Fig. 282, Bennett's gold leaf electrometer, $2 



and 2.50 



409 Fig. 283, Saussure's electroscope, 2.00 



410 Fig. 284, Volta's condenser, 6.00 



411 Fig. 285, Bennett's electrical doubler, - 5.00 



412 Fig. 286, universal discharger, - - $6 to 7.50 



413 Fig. 288, medical jar, - 2.50 



