ELECTRICAL LIGHTING.

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Presentation transcript:

ELECTRICAL LIGHTING

Outline Early Developments Arc-Light Incandescent Filament Lamp

Early Developments Incandescent Metallic Filaments de la Rue (1820) Short Life In Air - Oxidation Oxygen-Free Environment de la Rue (1820) Partial Vacuum Platinum - Melt & Glow At Close Temperatures

Early Developments (Continued) Previously Coal Gas Wax Candles Fish-Tail W. E. Staite (Mid 1840s) Platino-Iridium Alloy Filament Disintigrated Lecture 1847 Joseph Swan Was In Audience

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) Foucault (1850) Serrin (1857)

Arc-Light (Continued) Duboscq (1858) Regulator Used In Lighthouse By Holmes Steady Voltage Controlled Advance Of Electrode

Arc-Light (Continued) Crompton (1881) Indirect Lighting Bulb

Arc-Light (Continued) Jablochkoff (1876) “Electric Candle” Parallel Carbon Electrodes 4 mm Diameter Used AC