CONTENTS 



PAGE 



List of Illustrations v 



Foreword ix 



Chronology of Electric Light xi 



Early Records of Electricity and Magnetism i 



Machines Generating Electricity by Friction 2 



The Leyden Jar 3 



Electricity Generated by Chemical Means 3 



Improvement of Volta's Battery 5 



Davy's Discoveries 5 



Researches of Oersted, Ampere, Schweigger and Sturgeon 6 



Ohm's Law 7 



Invention of the Dynamo 7 



Daniell's Battery 10 



Grove's Battery 11 



Grove's Demonstration of Incandescent Lighting 12 



Grenet Battery 13 



De Moleyns' Incandescent Lamp 13 



Early Developments of the Arc Lamp 14 



Joule's Law 16 



Starr's Incandescent Lamp 17 



Other Early Incandescent Lamps 19 



Further Arc Lamp Developments 20 



Development of the Dynamo, 1840-1860 24 



The First Commercial Installation of an Electric Light 25 



Further Dynamo Developments 27 



Russian Incandescent Lamp Inventors 30 



The Jablochkofif " Candle " 31 



Commercial Introduction of the Differentially Controlled Arc Lamp ^3 



Arc Lighting in the United States 3;^ 



Other American Arc Light Systems 40 



" Sub-Dividing the Electric Light " 42 



Edison's Invention of a Practical Incandescent Lamp 43 



Edison's Three-Wire System 53 



Development of the Alternating Current Constant Potential System 54 



Incandescent Lamp Developments, 1884-1894 56 



The Edison " Municipal " Street Lighting System 62 



The Shunt Box System for Series Incandescent Lamps 64 



The Enclosed Arc Lamp 65 



The Flame Arc Lamp 67 



The Constant Current Transformer for Series Circuits 69 



Enclosed Series Alternating Current Arc Lamps 69 



Series Incandescent Lamps on Constant Current Transformers 70 



The Nernst Lamp 71 



The Cooper-Hewitt Lamp 72 



The Luminous or Magnetite Arc Lamp 74 



Mercury Arc Rectifier for Magnetite Arc Lamps yy 



ill 



