VI LIST OF ILLUSTRATIONS 



PAGE 



Diagram of Constant Current Series System 45 



Diagram of Edison's Multiple System, 1879 45 



Edison Dynamo, 1879 46 



Edison's High Resistance Platinum Lamp, 1879 47 



Edison's High Resistance Platinum in Vacuum Lamp, 1879 47 



Edison's Carbon Lamp of October 21, 1879 48 



Demonstration of Edison's Incandescent Lighting System 49 



Dynamo Room, S. S. Columbia 50 



Original Socket for Incandescent Lamps 51 



Wire Terminal Base Lamp, 1880 51 



Original Screw Base Lamp, 1880 52 



Improved Screw Base Lamp, 1881 52 



Final Form of Screw Base, 1881 53 



Diagram of Edison's Three Wire System, 1881 54 



Diagram of Stanley's Ahernating Current Multiple System, 1885 55 



Standard Edison Lamp, 1884 56 



Standard Edison Lamp, 1888 56 



Standard Edison Lamp, 1894 57 



Various Bases in Use, 1892 58 



Thomson-Houston Socket 59 



Westinghouse Socket 59 



Adapters for Edison Screw Sockets, 1892 60 



Various Series Bases in Use, 1892 61 



Edison " Municipal " System, 1885 62 



Edison " Municipal " Lamp, 1885 63 



Shunt Box System, 1887 64 



Enclosed Arc Lamp, 1893 65 



Open Flame Arc Lamp, 1898 66 



Enclosed Flame Arc Lamp, 1908 66 



Constant Current Transformer, 1900 68 



Series Incandescent Lamp Socket with Film Cutout, 1900 70 



Nernst Lamp, 1900 71 



Diagram of Nernst Lamp 72 



Cooper-Hewitt Mercury Vapor Arc Lamp, 1901 ']2^ 



Diagram of Cooper-Hewitt Lamp for Use on Alternating Current 74 



Luminous or Magnetite Arc Lamp, 1902 75 



Diagram of Series Magnetite Arc Lamp 'j(S 



Mercury Arc Rectifier Tube for Series Magnetite Arc Circuits, 1902 "/■] 



Early Mercury Arc Rectifier Installation 78 



The Moore Tube Light, 1904 79 



Diagram of Feeder Valve of Moore Tube 80 



Osmium Lamp, 1905 , 82 



Gem Lamp, 1905 83 



Tantalum Lamp, 1906 84 



Tungsten Lamp, 1907 86 



Drawn Tungsten Wire Lamp, 191 1 87 



Quartz Mercury Vapor Lamp, 1912 88 



Gas Filled Tungsten Lamp, 1913 89 



Gas Filled Tungsten Lamp, 1923 90 



Standard Tungsten Lamps, 1923 92 



