[N322AAD], Technical Note, Thomas Alva Edison, John F Ott, August 13th, 1886
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Title
[N322AAD], Technical Note, Thomas Alva Edison, John F Ott, August 13th, 1886
Editor's Notes
Tried several lamps having filiments with Alumina, Magnesia-- Calcium, Beryllium Zirconia-- from their chlorides & acetates dipping fibre in solution heating of Kerosense chimney to [decompose?] then passing quickly through flame-- The coating holds on filiment up to about 20 to 25 CP then it seems to jump off although some filiments held very well-- The contraction of the oxide while the filiment doesn’t contract but very little causes this cracking Martin has dipped a dozen carbon in Coal tar in Benzol & Liquorice in water then dipped them in finely powdered oxides of Alumina, Magnesia, and put them in mould & they are to be run through the carbonizing process, the Theory being that the tar will carbonize & lock the oxide together-- the coating is very fair though not complete= I am getting ready a lot of filiments about 1/2 carbonzied ie brought up to 600 deg fahr & these I am going to dip in Tar Liquorice etc H then in infusible oxides & then run through final carbonization the shrinkage of the carbon will then be about equal to the tar Carbon-- also I am going to dip some bamboo filiments in tar & infusible oxide & carbonize in regular way I am also going to soak fully carbonized filiments in tar-- Licorice & other Carbonizable materials in Liquid shape soaking the filiment before carbonization also when patially carbonized (this is probably the best period) & when fully carbonized so as to fill up the spaces & breaks due to the initial carbonization of the bamboo." [this is followed by notes on 172-174
Author
Date
1886-08-13
Type
Folder/Volume ID
N322-F
Microfilm ID
43:473
Document ID
N322AAD
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University