The Thomas A. Edison Papers Digital Edition

PDF: Archive.org
CSV: Metadata

Metadata

Title

[NA023207], Technical Note, Thomas Alva Edison, March 31st, 1889

Editor's Notes

Phono & EL Cav##Syrian or other Asphaltic substances heated to drive off nearly all volitile matter that comes of at 300 C then disolving in Chloroform & filltering to purify by ash or it may be done previously-- then disolving in Bisulphide after removal of chloroform & putting in the Bisulphide enough sulphur so an evaporation of solvent sulphur will be left mixed intimately with the asphalt The amount being sufficient to dehydrogenize the Asphalt & prevent melting during carbonization--##Also the Asphalt may be dried after purification & made into a past with Chloroform & strong Sulphuric acid.squirted &the fils-- The Sul acid at high temp reduces or enters into Combn to prevent melting & SO2 going off as a gas-- Iodine may also be disolved in Bisulphide of Carbon & on Evaporation the Iodine will act as a dehydrogenizer. Oxide of mercury can be mixed with the asphaltic material and on carbonization the O will dehydrogenize the Asphaltic Material & the Hg will go off in vapor thus leaving the filiment free.##By disolving the material after heating to drive off the very volitile constituents in chloroform orother go solvent not materially acted on by Chlorine The Chlorine may be passed through the solution until maximum Chlorinization or rather dehydrogenzation is obtained– afterwards to obtain a higher or greater dehydrogenzn of the material & this will depend on the material the solution may be treated with nitric acid one atom of O takes out H##Certain kinds of asphalt like purified Trinidad or Hard Cubian after purification by solvents wherein the ash isolated out, may be boiled in a wide flat dish constantly stirring atmospheric oxidation takes place at the same time the more volatile constituents are driven off and a point is reached when the material only remains soft at 400 C. In this state It may be squirted into filiments by heat around the die of the press by slow carbonization The remaining hydrogen can be driven off & the filiment fully carbonized without distortion##I have found as a rule that all that portion which is disolved out of an alsphaltic residue or mineral coal like Lignites or semi coals is preferable for this purpose to that disolved out by other solvents##The greatly dehydrogenized material of the Asphaltic or Bituminous Character stated has other solvents especially when aided by heat but the solvent action also greatly depends on the original nature of the material of which the residue came & also on the character of the reaction involved in dehydrogenzing it to the non melting point among Solvents are Methyl Alcohol, Chloral Hydrate, Oil Myrbane Aniline Oil, Oil Camphor Esculaptious oil Nitric Ether Nitrite of Amyl--Sulph-Hydrocarbon liquids like Sulpho-carymethylaminic oil mustard & several other Sulpho Compounds.##Hollow filiments may be squirted in the same manner as lead pipe & hollow Maccaroni. The advantage of hollow filiments are great with Large Candle power Lamps as it gives a more even carbonization throughout the mass--##A carbon filiment made from matter produced by the natural asphaltic material##A filiment for Carbonization formed from a plastic mass.##A carbon filiment made of the residues from the destructive distillation of organic matter artificially or naturally Asphaltic or Bituminous material##A filiment for carbonization formed from a plastic mass known as pitch asphaltic or Bituminous material [followed by large overstruck section] rendered infusible before carbonization by chemical agency–##A filiment of Carbon made from the ultimate decomposition of Organic material known as pitches asphalts or Bitumens##[crossed ot paragraph]Carbonaceous plastic material capable of being softened by heat or solvents formed into filiments by mechanical means and then subjected to a chemical action whereby that element which renders them fusible is displaced##A filiment of Carbon for an incandescent lamp made from pitchy Asphaltic or Bituminous products from the decomposition of organic material either artificial or natural.##Same & add– made infusible before carbonization##Same--dehydrogenzed by chemical agency to render such compounds infusible during the act of carbonization.

Author

Edison, Thomas Alva

Date

1889-03-31

Type

Technical Note

Subject

Patent application

Incandescent lamp

Folder ID

NA023-F

Microfilm ID

99:406

Document ID

NA023207

URL

https://edisondigital.rutgers.edu/document/NA023207

Rights

Thomas Edison National Historical Park

Publisher

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

Has Version

Archive.org Viewer, Microfilm Series Reel 99

Item sets

[NA023-F] N-88-03-15.2 (1888-1889)