[MB076], Letter from Thomas Alva Edison to Charles Batchelor, August 31st, 1882


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[MB076], Letter from Thomas Alva Edison to Charles Batchelor, August 31st, 1882

Editor's Notes

SELECT THIS AUTOGRAPH DOC. "Latest dodge carbonizing: W are using carbon forms & weights for holding fibreas instead of nickel and are getting even better carbons. I will send you a sample by mail of complete form & weight so you can make dies & punch. They are pressed in screw press little larger than ours. Use ground gas retort carbon mixedwith minimum quantity of crute [-----] thinned slightly by kerosene or crude coal tar. Puta little more pressure than we did on chalks then lay forms [--] on flat iron plate & bake very [--] up to say 400 or 500 Fahr so they dont shatter & warp then put them in your carbonziing covers and bring up the same as you would fibers in nickel forms ie, just as slow then stop you are OK & will never have any more trouble about melting forms, etc. We have run over 50 heats with them & they actually improve. Another thing we do use double covers thus:" [drawing]. Continues a bit, then says he's ordered Upton to send drawings of new furnaces. Pre-carbonizing expt with carbons. Suggests experiment with forms. Signed Edison.





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