CONTENTS, Vll 



SECTION II. 



SOURCES OF ELECTRICITY. 

 CHAPTEK V. 



BATTERIES. 



PA'.K 



Hydro-electric Batteries in Electro-chemistry Becquerel Cell Danicll 

 Ordinary Cell Dnniell Balloon Cell William Thomson Cell 

 Callaud Cell Meidinger Cell Bunsen Cell D'Arsonval Cell 

 Duchemin Cell Leclanche' Cell De Lalande and Chaperon Oxide 

 of Copper Cell Smee Cell Noe" Thermo-electric Battery Clamond 

 TliiTino-eK'Ctric 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 

 Elmore Machine Superiority of Dynamo-electric Machines over 

 Batteries Services rendered to Industry by Gramme Machines .. 73 



CHAPTEK 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, IliJ. Speed Table No. 2, Ditto, Slow Speed Table No. 3, 

 Ditto, for Kin t m-depositing Pur| < .. .. .. .. 88 



