248 



LOCALIZED ELECTRIZATION. 



Fig. 55. 



Via. 56. 



Fig. 55.— Large uncovered volta-faradic apparatus. Fig. 56.— Bundle of soft iron wire. 



rlieophores. This commutator has also otlier advantages, which it 

 is unnecessary here to describe. 5. The trembler (fig. 57) is so 

 constructed that the rapidity of the intermissions can be pro- 

 gressively increased, from four or eight in the second, to an almost 

 incalculable number in the same period of time. 



The battery is independent of the coil, and can be fixed to the 

 latter by the hooks M M (fig. 55). It is formed as already de- 

 scribed, but of four elements instead of three. The coil, like the 

 former one, can be worked by any battery whatever." 



§ II. — Manner of setting! the apparatus in action. 



1. Since 1861, as I have already stated, I have entirely aban- 

 doned the use of sulphuric acid for my flat batteries ; and have 

 used only the bisulphate of mercury. In order to charge the 

 battery, water must be poured over the carbon until it is well 

 saturated ; we then spread over its surface the bisulphate of mer- 

 cury, in sufficient quantity to form a layer about half a millimetre 

 in thickness, and we moisten this with a little water. We next 

 place upon the bisulphate the cloth diaphragm, first wetted with 

 water, and over tliis the plate of amalgamated zinc, which then 

 comes in contact with the platinum wires. Thus prepared, the 



' The large uncovered apparatus at my 

 own house is worked by a sulphate of lead 

 battery of twenty pairs. So powerful a 



source of electricity is not necessary ; but 

 this battery also maintains in action my 

 electric clocks and chamber telegraph. 



