Photograph of Nikola Tesla experimenting with a high frequency apparatus in operation, IE a Tesla coil transmitting power wirelessly. His Colorado Springs lab was in operation from May 1899 to January 1900 and then it was quickly dismantled for scrap by 1905, which formally stood at 32 N. Foote Avenue.

Article Reference:

Photograph of lab, 1918-02-00-p211_Popular_Science

Springs Lab Site of Scientist Tesla Finally Located, Augst 11, 1984, page 1B, by Stephanie Hilf, Colorado Springs Gazette.