[NM030019], Technical Note, Thomas Alva Edison, June 22nd, 1887
https://edisondigital.rutgers.edu/document/NM030019
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Title
[NM030019], Technical Note, Thomas Alva Edison, June 22nd, 1887
Editor's Notes
"Cylinders for phonographs Take split mould you used for Plaster Paris & mould following substances Melt Asphalt in Crucible pour-- Melt [asphalt] mixed with equal quantity Kaolin. Melt Rosin mixed with 1/4 weight or bulk of Asphalt. Melt Rosin mixed with 1/4 weight Chalk or Kaolin [Melt Rosin mixed with] 1/2 [weight Chalk or Kaolin] Melt Parafine mixed with 1/2 its bulk Rosin Melt [Rosin mixed with] 1/2 [its bulk] Chalk or Kaolin Duplicating Ink-- Aniline Violet in water strong solution mixed with gum tagacanth, various proportions of each Write on good writing paper; after drying transer to Blotting paper moistened, then from this take the duplicate. Rig up a vat for covering parafine paper on one side only [drawing]"
Author
Date
1887-06-22
Type
Folder/Volume ID
NM030-F
Microfilm ID
106:666
Document ID
NM030019
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University