Joseph Swan (1847)

1
Incandescent Filament Lamp

• Joseph Swan (1847)
• Patent By J. W. Starr (1845)
• The application of continuous metallic and
  carbon conductors, intensely heated by the
  passage of a current of electricity, to the
  purpose of illumination
• Thin Sheet Of Platinum Foil
• Torricellian Vacuum
• Disliked The Use Of A Platinum Filament
• Carbon Filament In A Vacuum Appealed To Him
• Incandescent Strip Of Carbon - 0.2 Wide, 1.5
  Long

2
Incandescent Filament Lamp

• Joseph Swan
• Publicly Displayed
• December 18, 1878
• Not In Operation
• Never Patented Idea
• Though Idea Was Anticipated thus, Not
  Patentable
• Carbon Filament

3
Incandescent Filament Lamp

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

4
Incandescent Filament Lamp

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

5
Incandescent Filament Lamp

• Edison Carbon Filament Lamp (1881)
• Edison Carbon Filament Lamp (1882)
• Edison Lamp Cluster (1884)