[LB013002], Letter from Thomas Alva Edison to Charles Batchelor, August 31st, 1882
https://edisondigital.rutgers.edu/document/LB013002
→ View document with UniversalViewer
→ View document on Archive.org
→ Re-use this digital object via a IIIF manifest
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
Recipient
Date
1882-08-31
Type
Folder/Volume ID
LB013-F
Microfilm ID
81:767
Document ID
LB013002
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University