IV CONTENTS 



PAGE 



Incandescent Lamp Developments, 1894-1904 78 



The Moore Tube Light 79 



The Osmium Lamp 82 



The Gem Lamp 82 



The Tantalum Lamp 84 



Invention of the Tungsten Lamp 85 



Drawn Tungsten Wire 87 



The Quartz Mercury Vapor Arc Lamp 88 



The Gas-Filled Tungsten Lamp 89 



Types and Sizes of Tungsten Lamps Now Made 91 



Standard Voltages 93 



Cost of Incandescent Electric Light 93 



Statistics Regarding the Present Demand for Lamps 94 



Selected Bibliography 95 



