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Unformatted text preview: ELECTRICAL LIGHTING ELECTRICAL Outline Outline Early Developments Arc-Light Incandescent Filament Lamp Early Developments Early Incandescent Metallic Filaments Short Life In Air - Oxidation Oxygen-Free Environment de la Rue (1820) Partial Vacuum Platinum - Melt & Glow At Close Temperatures Early Developments (Continued) Early Previously Coal Gas Wax Candles Fish-Tail W. W. E. Staite (Mid 1840s) 1840s) Platino-Iridium Alloy Platino-Iridium Filament Filament Disintigrated Disintigrated Lecture 1847 Joseph Swan Was Joseph In Audience In Arc-Light Arc-Light Staite (1847) Carbon Arc Automatic Feed “Pyrometric Principle” Heat Increases As Arc Lengthens Carbon Consumed Heat Generated Carbon Wire Expands Allowed Rack To Move Raised Carbon Electrode 1853 - Shown Limited By Daniell Cells Of Time No Financial Backing Arc-Light (Continued) Arc-Light Serrin (1857) Foucault (1850) Arc-Light (Continued) Duboscq (1858) Regulator Used In Lighthouse By Holmes Regulator Steady Voltage Controlled Advance Of Electrode Arc-Light (Continued) Crompton (1881) Indirect Lighting Bulb Arc-Light (Continued) Jablochkoff Jablochkoff (1876) (1876) “Electric Candle” Parallel Carbon Parallel Electrodes Electrodes 4 mm Diameter Used AC ...
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