[NS82ABG], Technical Note, Thomas Alva Edison, October 4th, 1882



SELECT THIS. Notes on things to try, apparently to encase filament in "solid glass." "Carbon surrounded with pure silica & brought to incandescence under vacu, the glass melted. Use this process coat carbon with zircon, silica, manganese, etc. Varous sketches. Notes on parchmentizing paper. Instructions to "Mix collodioon with parchmentied jelly of cellulose & see if it don'es make a good solid material. Carbonize lamp wick." {SEE OED 'PARCHMENTIZE: 1882 J. SWAN in Nature 10 Aug. 357 A carbon filament produced from parchmentised cotton thread.} Try thread paper etc in hydroflouric acid. The acid will go away itself & render washing unnecessary. Try phosphoric acid for parchmentizing." this is marked CAVEAT. "Glass tubes with hole just enough carbon go throuh it will probly seal when carbon worked on pumps & thus prevent carrying." Then "Patent two fibres in one globe that can be lighted separately, then exhaust & bring up both then if uneven pass cyanogen or Hcarbon gas or Chlo Carbon preferably cyanogen as it leaves no white & equalize them then connect together in one socket so as to get 20 candles from both & give 500 ohms." Then Patent: "The wire or carb filament that goes into the globe has a greater surface than the filament." "Glass partition; see if this in foreign patent. Look at spark gauge see if there is blacking of plat wire in glass where sealed." Some sketches of two-globe lamps, with some accompnying text.







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[NS82ABG], Technical Note, Thomas Alva Edison, October 4th, 1882

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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University