Verify out these nikola tesla oscillator blueprint:
Twain_in_Tesla's_Lab
Image by scottobear
Mark Twain (penname of Samuel Langhorne Clemens) in the lab of Nikola Tesla, spring of 1894.
Taken in the spring of 1894, and originally published as part of an report by T.C. Martin called "Tesla's Oscillator and Other Inventions" that appeared in the Century Magazine (April 1895).
Image is in the public domain.
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