Knob Hill, Laboratory in Colorado Springs, United States.
Knob Hill was a research site in Colorado Springs, United States, where experiments in wireless power transmission took place using advanced electrical equipment. The facility featured a tall mast and coils that generated powerful electrical discharges and illuminated the surrounding grounds.
Tesla built the facility in 1899 with financial backing from John Jacob Astor IV to test theories about wireless power transmission. Operations ended in 1904, and the building was torn down shortly after to settle unpaid debts.
The site featured a wooden tower topped with a large copper sphere that became visible across town during experiments and served as a landmark for early electrical research. Residents reported unusual light displays in the night sky when Tesla ran his tests.
The site sits at the intersection of Kiowa Street and Foote Avenue in Colorado Springs, where no physical remains are visible today. A memorial plaque marks the spot and recalls the early experiments with electrical power.
One experiment caused an overload that produced a discharge strong enough to damage the power station generator and briefly cut electricity across the entire town. Work often took place at night to avoid straining the local power supply.
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