CONTENTS. xi 



PAGE 



Lout ill's System . . i oo 



Gramme's System 104 



Siemens' System 107 



Jablochkoff 's System ...no 



COMPARATIVE EXPERIMENTS ON THE EFFECTS PRO- 

 DUCED BY THE DIFFERENT ELECTRO-MAGNETIC 



MACHINES Ill 



EFFECTS OF THE RESISTANCE OF EXTERNAL CIRCUITS... I2O 



RESULTS PRODUCED BY COUPLING TWO MACHINES ... 122 



TABLE OF THE AMERICAN EXPERIMENTS... 123 



COMPARATIVE TABLE OF THE ENGLISH EXPERIMENTS 124 5 

 TABLE OF NEW EXPERIMENTS (SHOOLBRED) ... 126 / 



APPARATUS FOR EVOLVING THE ELECTRIC LIGHT ... 128 



Light produced between carbon electrodes... 128 



"Jacquelairis Method ... 131 



Carre's Method f ,.. 132 



Gauduiffs System ... 1 34 



Effects produced by the addition of Metallic 

 Salts to the Carbons prepared for the 



Electric Light ... /.?-*'.-' 135 



Metallized Carbons ... ... ... ... 137 



Effect of heat on the conductivity of the 



carbons ,.. 139 



Light produced by means of conductors of 



indifferent conductivity 140 



Jnblochkoff's System ... ... \ ,'&> J4 



Lodyguine and Kosloff's System < .... 144 



Edison's System .... ... ... 145 



Systems nf E. Reymer, Wtrdermajm, and others ... 146 

 Light produced by means of an inductive 



action ... .., * v.i r !5 



