i8 



MAWSON & SWAN, 



Planters Secondary Battery.^ With this battery, charged by two of 

 Bunsen's elements or *a Gramme machine of medium size, all 

 the experiments in diamagnetism and the electric light can be 

 produced for which large batteries are usually employed. The 

 battery will require recharging after some minutes, but will 

 remain in action long enough to allow of all these experiments 

 being observed. 



Planters Secondary Cell, surface of lead about 125 square inches, 15,'- 



13 and 15, Mosley-street) Neivcastle-on-Tyne. 



