The Thomas A. Edison Papers Digital Edition

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Metadata

Title

[N320193], Technical Note, Thomas Alva Edison, May 1st, 1887

Editor's Notes

"Electric Lamp Experiments Disolve or rather mix as much pure Alumina also Magnesia with Asphalt Solution possible-- dip preliminarized Regular A Carbon & also carbons in Solution so surface when Carbonzed will be partially of a non conducting infusible oxide {Martin} No 2 Make a order number 15 going to clamp dept make a strong acetate of Magnesia-- Lime, Alumina the solution nearly saturated & syrupy then dissolve all the Sugar it will take up in the solution dip preliminary filaments & also carbons on carbonization this will give a carbon Magnesium surface-- make 15 of each kind {Martin} Pack some new stock filiments in powdered Asphalt & run up to as high as possible say 600 fahr take out while hot & pour it out getting filiments out & disolving off asphalt-- then dip in regular asphalt solution & preliminarys also Linseed oil-- also Linseed oil loaded with asphalt {Ent Hamilton} Dip preliminarized fibres prelim to 500@600 in melted asphalt at 600@700 fahr-- Try melted sugar arrange to duplicate 234 in our new process but putting filiments under strain-- Duplicate a good new stock curve but using carbon instead of metal boxes-- {Martin} Run some new stock through with powdered fusible metal securing filiments so they wont float when metal melts {Hamilton} Put a pine stick in metal tube which stick has been soaked in saturated solution Tannic acid put some tannic acid in bottom bring up quickly in stove of pump room {John Ott} also put pine stick in tube with Red Oxide Mercury in bottom to give off oxygen {John Ott} preliminarize fibres in following liquids as high as possible-- Melted Rosin-- Anthracene, Chrysene-- Mp 275C Hexabrombenzine C2Cl6 Mp 182C The Haloids may produce beneficial chemical reaction Hexachlorbenzine Mp 222C Try flow Sulphur to prelminize in metls 113C boils 447C [opposite page: "Tri bromide Bismuth melts 198 boils red heat Fusible metal 4 Bi-- 1 Cadmium-- 2 Lead 1 tin 4Bi-- 1Cd 2 Pb 1 Sn Antimony Trichloride melts 73 boils 230 at pressure atmos & 160 in vac-- Stannous Chl melts 240-- boils 617--] preliminize in glycerine, olive oil, Sugar alone-- powdered fine-- phenol 187C boiling pt. Boil some fully carbonized filiments secured in reg forms in Sulphuric acid out doors until they bend-- then take out & run curve-- take some dips in asphalt sol & run through whole of reg process-- {Marshall} put some regs carbons in strong water & SO4 sol put current on & oxidize the surface until very black-- also put in nitric acid do same some sets more than others & longer-- then treat with asphalt after they have been heated & washed to get acid out object is to remove the outer scale-- {Payne} Take lot carbons & pass them through flame so they are partially oxidzed treat with asphalt Take reg Carbon mounted on inside part dip in asphalt solution 24 hours seal in Lamp & then gradually bring fil up in Vac while pump running to carbonize asphalt surface stopping each time to permit gas to be evacuated Make 6 in this manner get cuve-- {Marshall} ascertain on a reg set up at 80 The increase of Resistance every hour until busted. Then take another and put at 80 selecting one of same economy & volts & insert Res equal each time to increase on the one burning & see what CP will come to don’t burn the standard only during test with Res-- object is to see how much decrease in CP is due to increase of resistance-- {Marshall} Melt some Zinc get it red hot plunge secured fibres in it. Also try copper molten in white hot. Run Curve also a curve after being treated with asphalt & run through reg process-- {Payne} Carbonize ie preliminize some filiments in Aqua regia weak-- also in melted Sulphide Potassium {Hamilton} Put lamp on pump with stop cock under Hg-- get Vac & work lamp regular then close cock & let it burn at say 80 CP near as possible for 2 hours keeping pump running-- then turn cock & see if air ha accumulated-- {Marshall} Try passing current through reg filiment secured to inside part diping in [Linseed?] Molten Asphalt also sugar {Payne} Try preliminizing fibres in Linseed oil, Linseed loaded with asphalt, asphalt in turpentine-- Sugar etc in sealed glass tubes-- up to 5@700 fahr also try Haloid combinations with carbon-- Chls Carbon etc-- {Hamilton} Make couple extra brass tubes suspsend in them pine pieces allow them to remain in Lamp heating stove 1 to 3 days Keep record of time & deliver to me {John Ott} Float on surface of Asphalt baths & also sugar solution best electrotypers plumbago quite thick so that when solution goes down it will leave a surface of plumbago-- you can do this in a small experimental bath that will do 25 carbons at a time also try Mangesia Oxide Oxide Alumina etc, this will give good reflecting surface make order No of 15 each kind {Martin} Have box made iron [drawing] put regs in forms secured fill with Hg & preliminize various speeds condensing Hg-- sand bath {Payne}

Author

Edison, Thomas Alva

Mentioned

Hamilton, Hugh De Coursey

Marshall, John Trumbull

Payne, Arthur Coyle

Date

1887-05-01

Type

Technical Note

Subject

Inventions and creativity

Carbon, coal, glass, ceramics

Incandescent lamp

Folder ID

N320-F

Microfilm ID

43:381

Document ID

N320193

URL

https://edisondigital.rutgers.edu/document/N320193

Rights

Thomas Edison National Historical Park

Publisher

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

License

CC0 1.0 Universal

Has Version

Archive.org Viewer, Microfilm Series Reel 43

Item sets

[N320-F] N-86-08-17 (1886, 1887)