Incandescent Filament Lamp u Joseph Swan 1847 t

Incandescent Filament Lamp u Joseph Swan (1847) t Patent By J. W. Starr (1845) w “The application of continuous metallic and carbon conductors, intensely heated by the passage of a current of electricity, to the purpose of illumination” w Thin Sheet Of Platinum Foil w Torricellian Vacuum t Disliked The Use Of A Platinum Filament t Carbon Filament In A Vacuum Appealed To Him w Incandescent Strip Of Carbon - 0. 2” Wide, 1. 5” Long

Incandescent Filament Lamp u Joseph Swan t Publicly Displayed w December 18, 1878 t Not In Operation t Never Patented Idea w Though Idea Was Anticipated & thus, Not Patentable t Carbon Filament

Incandescent Filament Lamp u Joseph Swan t First Successful Filament Lamp (1881) w w w Carbon Filament Thickened Filament Ends Evacuated Glass Bulb Platinum Filament Supports Glass Supports For Filament Holders w Platinum End Wires w Exhausting “Pip” t Applied For Patent w November 27, 1880

Incandescent Filament Lamp u Thomas Alva Edison (1847 -1931) t Initially w Lamp Filaments From Carbon Impossible w Thought He Was Successful With Platinum t Switched To Carbon (1879) w Successful February, 1880 w Applied For Patent ? ? ? ? t Developed Ideas For Commercializtion t Joined With Swan To Form w Ediswan Electric Co.

Incandescent Filament Lamp u Edison Carbon Filament Lamp (1881) u Edison Carbon Filament Lamp (1882) u Edison Lamp Cluster (1884)