[NM020ABF], Technical Note, Thomas Alva Edison, September 26th, 1886


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[NM020ABF], Technical Note, Thomas Alva Edison, September 26th, 1886

Editor's Notes

[685 686 & 687] "Dick Patent I take the vegetable filiment before carbonziation and soak it for several hours in a solution which contains disolved carbonizable matter such as sugar molasses, Licorice, coal tar= these materials permeating the interstices between the microscopic fibres of which the filiment is made up the filiment is then taken out of the solution the surface cleaned from the adhering solution & then allowed to dry afterwards it is placed under strain & pressure in the moulds & then put in closed boxes & carbonized the extra material being between the fibres carbonization & seems to lock them together and thus cause the electric current to pass through all parts of the filiment equally claim-- The strength of the solutions should be of a consistency a little less than table syrup-- it may be varied within wide limits and still accomplish the results-- Claim soaking the filiments of previous to carbonization in a solution containing a carbonizable material in solution.-- Dick-- I think some one has soaked wood in sugar etc & afterwards carbonized same for arc carbons, so draw your claims accordingly 2nd patent Doing the same thing to filiments already carbonized or partially carbonized & then carbonizing them again & fully Dick Carree makes his arc carbons by squirting the compound of ground carbon & tar through die carbonizing & then soaking in sugar etc & recarbonizing hence you should draw your claims to get around this. Prepare these immediately




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