American chemist and inventor (1853-1927) best known for several innovations related to explosives, including smokeless gunpowder. TLS, one page, 8.5 x 6.5, personal letterhead, October 17, 1915. Letter to pioneer electrical engineer and aviator William J. Hammer, in full: "The cuttings have come, and I am very much obliged to you. As soon as I have looked them over I will return them to you." In fine condition, with a rusty circular paperclip impression to the edge.
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