[LB061303], Letter from Thomas Alva Edison to Edward Goodrich Acheson, November 19th, 1894
https://edisondigital.rutgers.edu/document/LB061303
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Title
[LB061303], Letter from Thomas Alva Edison to Edward Goodrich Acheson, November 19th, 1894
Author
Recipient
Mentioned
Date
1894-11-19
Type
Subject
Folder/Volume ID
LB061-F
Microfilm ID
143:703
Document ID
LB061303
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Has Version
Item sets
Transcription
Nov 19 1895
E G Acheson Esq
Your letter received – in reply would state that to any inquiry from a party in Boston I did state that we had tried Carborundum at the phonograph works and found it unsuitable for cutting Saphire We pick out the hardest Ceylon Saphire & grind with diamond dust, This kind of Saphire [will?] abrade Corundum like chalk & I do not believe anything on earth but diamond dust will cut it
Yours
Thos A Edison
E G Acheson Esq
Your letter received – in reply would state that to any inquiry from a party in Boston I did state that we had tried Carborundum at the phonograph works and found it unsuitable for cutting Saphire We pick out the hardest Ceylon Saphire & grind with diamond dust, This kind of Saphire [will?] abrade Corundum like chalk & I do not believe anything on earth but diamond dust will cut it
Yours
Thos A Edison