[LM241013], Letter from Walter Seeley Mallory to James B Ballantine, September 17th, 1900
https://edisondigital.rutgers.edu/document/LM241013
Transcription
September 17th, 1900 Mr. James Ballantine Edison, N.J. Dear Sir:-- Do not fail to enter in a book the results of test made by hand on briquettes for porosity and he wants to know how you make the test to get from 13 to 15%. Please send this to me in detail . Yours very truly, W.S. Mallory