CONTENTS. Vll 



SECTION II. 



SOURCES OF ELECTRICITY. 

 CHAPTEK V. 



BATTERIES. 



PAGE 



Hydro-electric Batteries in Electro-chemistry Becquerel Cell Daniell 

 Ordinary Cell Daniell Balloon Cell William Thomson Cell 

 Callaud Cell Mei din ger Cell Bunsen Cell D' Arson val Cell 

 Duchemin Cell Lcclanche Cell De Lalande and Chaperon Oxide 

 of Copper Cell Smee Cell Nod Thermo-electric Battery Clamond 

 Thermo-electric Battery 59 



CHAPTER VI. 



DYNAMO-ELECTRIC MACHINES. 



General Characteristics of Dynamo-Electric Machines Various Defini- 

 tions Gramme Machine Ring for an ordinary size Machine 

 Ring for a large size Machine Gramme Machine for Electro-deposi- 

 tion Current Interrupter Prices of Gramme Machines Siemens 

 Machine Schuckert Machine Prices of Schuckert Machines- 

 Mather Machine Wilde Alternating Redressed Current Machine 

 Weston Machine for Electro-deposition Prices of Weston Machine 

 Elrnore Machine Superiority of Dynamo-electric Machines over 

 Batteries Services rendered to Industry by Gramme Machines .. 73 



CHAPTER VII. 



CAPACITY AND EFFICIENCY OF ELECTRIC GENERATORS. 



Definitions; Capacity Electrical Efficiency Mechanical Efficiency 

 Electromotive Force of Batteries Maximum Capacity of one Cell of 

 a Battery Electrical Efficiency of a Battery Maximum Capacity 

 of a Battery composed of a certain number of Cells Electromotive 

 Force of Dynamo-electric Machines Magneto-electric Machine 

 Electro-magnetic Machine Maximum Capacity of an Electric 

 Machine Experiments on a Gramme Machine Table No. 1, Normal 

 Type, High Speed Table No. 2, Ditto, Slow Speed Table No. 3, 

 Ditto, for Electro-depositing Purposes .. .. .. .. 88 



