ELECTRICAL APPARATUS. 



249 



mode of constructing the conductor of a plate machine, occu- 

 pying but little room on the lecture table. The machine, 

 as regards the mounting of the plate, is arranged as Cuth- 

 bertson's, having a longer base and stout glass supports at 

 each end ; beyond the edge of the plate and opposite thereto, 

 on which are placed the conductor, which is formed of long 

 brass tubes about 2 inches in diameter, having large balls at 

 each end, and connected together at the top by a tube of the 

 same size. To the lower balls are arms, having rows of 

 points, and collecting the fluid from both sides of the plate. 

 There are suitable holes in different parts of the conductor 

 for inserting electrometers, wires, &c. 



This construction of the electrical machine has given the 

 highest satisfaction to those who have used them. 



Price, 13-inch, $25.00. 



" 16-inch, $30.00. 



20-inch, $38.00. 



Fig 268. 



CutJibertsori's Plate Electrical Machine. This machine 

 (Fig. 268, as above) consists of a plate of glass, of not less 

 than 12 inches diameter, turning on an axis that passes at 



