[LB062494], Letter from Thomas Alva Edison to Merck & Co, May 29th, 1896
https://edisondigital.rutgers.edu/document/LB062494
Transcription
May 29- 1896. Messrs Merck and Coy- 73 William Street New York Dear Sirs:- I beg to acknowledge with thanks the receipt of the Template. The crystals have been powdered too fine, they only have one third the sensitiveness of the crystals I have. I do not break the crystals smaller than 140 mesh sieving out all finer than 140 and all Coarser than 100. Yours truly Thos A Edison