M0014782 Nikola Tesla, with his equipment Credit: Wellcome Library, London. Wellcome Images [email protected] http://wellcomeimages.org Nikola Tesla, with his equipment for 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' Photograph 1901 Published: - Copyrighted work available under Creative Commons Attribution only licence CC BY 4.0 http://creativecommons.org/licenses/by/4.0/