[LB013002], Letter from Thomas Alva Edison to Charles Batchelor, August 31st, 1882
https://edisondigital.rutgers.edu/document/LB013002
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- Title
- [LB013002], Letter from Thomas Alva Edison to Charles Batchelor, August 31st, 1882
- Editor's Notes
- Latest dodge Carbonizing##We are using Carbon forms & weights for holding fibres 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 a disc & punch= They are pressed in screw press little larger than ours= Use ground gas [retent] Carbon mixed with minimum quantity of C[rude] [Authorauim] thinned slightly by Kerosene [----] Cool [for] put a little more pressure than we did on chacks= then lay [formula] on flat iron plates & bake very gently up to say 400 or 500 fahr as they dont blister & warp then put them in your Carbonizing Covers & bring up the same as you would fibres in nickel form i.e. just as slow [they] 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 we use double [C---] [th--] [art]##The Cotton should be carbonized first & only to a red heat it is then very sensitive to Oxygen The object is to keep out oxygen.##With Carbon forms you can go up to as high a temperature as your fire brick will stand= we are using a special fire brick used by Wharton to melt nickel you can doubtlessly get good ones there##I have ordered UPton to send you wkg drawings of our new furnace we have 4 going they work splendid.##We are running through several hundred Lamps the carbons of which were laid out straight in a bundle between Carbon blocks also in bundles [tied] with thread & carbonized of [Ce---] [-----] is bent as a loop & put in Clamps and plated, they seem to be as good as regular & make far [nicer] lamps as they follow the Carbon of the bulb [art]##There is [---] [be] trouble putting these in bulb as the bulb is previously little bell mouthed & it acts as a squeezer {art]##One improvement you might adopt in making your forms over & over is [art]##overlapping this will prevent circulation of oxygen##I forget to say that we put two fibres in our mould. More [ana]
- Author
- Edison, Thomas Alva
- Recipient
- Batchelor, Charles
- Date
- 1882-08-31
- Type
- Letter
- Folder ID
- LB013-F
- Microfilm ID
- 81:767
- Document ID
- LB013002
- Publisher
- Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
- Has Version
- Archive.org Viewer, Microfilm Series Reel 81
- License
- CC0 1.0 Universal
- Item sets
- [LB013-F] LB-013 (1882-1883)