MAWSON & SWAN, 



CATALOGUE OF 



Electrical and Galvanic Apparatus. 



FRICTIONAL ELECTRICITY. 



APPARATUS TO PRODUCE ELECTRICITY. 



Rod of Sealing Wax, for the production of negative electricity, 1/6 



Rod of Glass,, smooth, from i/- 



Rod of Glass, roughened, from 1/6 



Rod of Glass, half smooth, half roughened, i/- and 2/6 



Rod of Sulphur, i/- 



Rod of Ebonite, i -, 2/-, 3/6, and 4,6 



Volta's Electrophorus, for obtaining the electric spark by induction, 

 consisting of i2-in. ebonite plate with 8-in. brass plate and 

 glass handle. Best finish, i is. 



Electrophorus, same construction, second quality, "13/6 

 Electrophorus, i2-in. resin plate, brass cover,' glass handle, io/- 



Electrophorus, i2-in. gutta-percha base, and ro-in. disc of tin, with 

 glass handle, 4/- 



Cat Skins, 4/6 each. 

 Fur Rubbers, i/- 



13 and 15, Mosley-street, Newcastle-on-Tyne. 



