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Tesla's laboratory at 46 & 48 East Houston Street in New York City.  Shown is a demonstration of his system for the transmission of electrical energy through natural media a view of his magnifying oscillation transformer in action.  Actual width of space traversed by the luminous streamers issuing from the single circular terminal terminating the extra coil is over 16 feet; the area covered is approximately 200 square feet.  Estimated pressure is 2 1/2 million volts, the safe limit for this laboratory.  It was here that Tesla discovered extraordinary conductive properties of the atmosphere, and to pursue these investigations further he sought to establish an experimental station at a remote location where he would be unrestricted in producing vastly greater voltages.  Circa 1896-1898.