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Nikola Tesla, with his equipment for

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Lettering

Inscribed: 'To my illustrious friend Sir William Crookes of whom I always think and whose kind letters I never answer! Nikola Tesla June 17, 1901'

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producing high-frequency alternating currents.

Inscribed: 'To my illustrious friend Sir William Crookes of whom I always think and whose kind letters I never answer! Nikola Tesla June 17, 1901'




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Credit: Wellcome Collection

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