[LB059228], Letter from Thomas Alva Edison to James R Coche, December 9th, 1896
https://edisondigital.rutgers.edu/document/LB059228
Transcription
Dec 9 96 Dr James R. Coche Boston. Mass Dear Sir:- In reply to your favor of the 30th ult, I beg to state that I am working on myself blindfolded with different tubes. Any results of importance will be given to the papers and they can easily be repeated at Boston. Yours truly Thos. A. Edison R[andolph]