Croatian-born physicist and electrical engineer. The Tesla, a unit of magnetic flow density, is named after him. Uncommon TLS signed “N. Tesla,” one page, 8 x 10.5, personal letterhead, July 11, 1894. Letter to a gentleman in Cleveland. In full, “I am in receipt of your sample of telegraphed photo for which I thank you. The result is interesting, but there is much room for improvement left. I hope that you will succeed in mastering the difficulties.” In very good condition, with moderate intersecting mailing folds, two small notations above text, sightly trimmed lower edge, and a staple hole to top left corner. Tesla’s neat and crisp signature is unaffected. LOA John Reznikoff/PSA/DNA and R&R COA.
