45, CORN HILL, E.G., AND 122, REGENT STREET, W., LONDON. 413 



f 



FIG. 2381. 



FIG. 2380, 



2381 



2382 



2383 

 2384 



2385 



2386 



2387 



2388 



2389 



Plate Electrical Machine. Winter's arrangement. The Plate in this 

 machine is mounted upon an insulating Glass axis ; this, in connection 

 with a large wood-covered metal circle placed on top of the prime 

 conductor, considerably increases the length of spark ; from a 15-inch 



plate t> to 8-inch sparks may be readily obtained (fig. 2381) 

 Woodward's Double 24-inch Plate Electrical Machine, 



a very splendid and powerful instrument . 

 Holtz' Electrical Machine, with 22-inch Vulcanite Plate 

 Holtz Machine, mounted with 2 movable Plates . 



5 10 



26 

 20 

 25 



Plate Electrical Machines, with a selection of Apparatus for exhibiting the 

 most popular and interesting experiments in Frictional Electricity, Packed 

 in a deal case, with lock and key . . 6 6s. 10 10 20 



Volta's Electrophorus, for obtaining the electric 

 spark, a very useful instrument for the Laboratory, 

 Resin Base with Brass Plate . . . from 



Electrophorus, cheap arrangement, 12-inch disc of 

 Gutta Percha, and 10-inch disc of Tin Plate with a 

 Glass Handle ........ 



Electrophorus, Improved, with Vulcanite or Ebonite 

 Base, with Brass Plate (fig. 2388) . 5-inch, 1 8s. 



Cannon Electrophorus, mounted with an electrical 

 cannon, for firing mixtures of hydrogen and 

 atmospheric air (fig. 2389) 



12 6 



086 

 9-inch, 220 



2 12 6 



