[LB062455], Letter from Thomas Alva Edison to F Kolh, April 29th, 1896
https://edisondigital.rutgers.edu/document/LB062455
Transcription
F. [Koch?] Esq Bochum Germany Dear Sir:- In reply to your favor of the 12th inst, I beg to state that I have taken photographs of the hand in one seconds. The material for the screen is crystalized Tungstate of Calcium, put on a sheet with Collodian [Collodion] and placed in a dark box, everybody uses them in this Country and they are called “Fluoroscopes” Yours truly Thos. A. Edison R[andolph]