Brilliant and versatile Croatian-born American inventor and engineer (1856–1943) whose discoveries revolutionized the understanding and practical applications of electricity and magnetism. TLS signed “N. Tesla,” one page, 8 x 10.5, personal letterhead, July 25, 1894. Tesla writes to N. S. Amstutz in Cleveland. In part: “The identical experiment which you illustrate was performed by Messrs. Spottiswoods, Gordon and others a very long time ago, and the same observation was made in regard to the properties of the current when the breaking was rapid. I think that in your experiment the strength of the current was reduced and the E.M.F. increased when the wheel was more rapidly rotated…. It is difficult to say exactly what the result in your case was, because it depends entirely on the electrical constants of the circuits and on the rate of breaking.” Tiny blot to one letter of signature and mailing fold between first initial and last name, otherwise fine, crisp, bright condition. A terrific combination of visual appeal and scientific content! LOA John Reznikoff/PSA/DNA and R&R COA.
