SECTION II. 



SOURCES OF ELECTRICITY. 



CHAPTER V. 



BATTERIES. 



Hydro-electric Batteries in Electro-chemistry Becquerel Cell Daniell Cell 

 Simple Bath Balloon Cell Thomson Cell Callaud Cell Meidinger 

 Cell Bunsen Cell D'Arsonval Cell Duchemin Cell Leclanche" Cell 

 Oxide of Copper Cell Smee Cell No4 Thermo-electric Battery Clamond 

 Thermo-electric Battery. 



HYDRO-ELECTRIO BATTERIES IN ELECTRO-CHEMISTRY. The 

 hydro-electric batteries mostly used in electric operations are 

 those of Daniell, Bunsen, and like inventors. For thin deposi- 

 tions, and especially when the work is intermittent, Leclanche, 

 Lalande and Chaperon's cells can be used, as also generally all 

 cells having the property of giving a regular current for a long 

 time without wasting when not at work. 



We will briefly describe the cells in use, and draw attention 

 to the alterations which could be made in them in order to make 

 them more economical or less offensive in industrial practice. 



BECQUEREL CELL. To Becquerel is due the first parti- 

 tioned cell with two liquids and two metals. This cell con- 

 sisted of a glass vessel partitioned in two compartments by 

 means of a sheet of gold-beater's skin; in one compartment 

 were placed a solution of nitrate of copper and a strip of copper 

 sheet, aud in the other a solution of nitrate of zinc and a strip 

 of zinc sheet. The Becquerel cell is almost identical with that 

 which has been called the Daniell cell, and which is considered 



