Brilliant and versatile Croatian-born American inventor and engineer (1856–1943) whose discoveries revolutionized the understanding and practical applications of electricity and magnetism. Extremely scarce ALS in French, signed “N. Tesla,” three pages on two adjoining sheets, 4.25 x 6.25, embossed Waldorf-Astoria, New York letterhead, April 23, 1899. in full (translated): “I have received your kind letter yesterday but it was impossible for me to reply immediately. I hope that you will be kind enough to excuse me for the apparent neglect. I have felt a deep regret not being able to take advantage of your generous hospitality the state of my health having not changed considerably. Hoping to have in the near future the pleasure to see you again.” Some light mirroring of letterhead along bottom of page, light paperclip impression to top edge, and some scattered light toning, otherwise fine condition. Pre-certified John Reznikoff/PSA/DNA and RR Auction COA.
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