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Tragedy struck March 13, 1895, when the laboratory was burned to the ground. Charles Dana, editor, the New York Sun, remarked in its columns,
The destruction of Nikola Tesla's workshop, with its wonderful contents, is something more than a private calamity. It is a misfortune to the whole world. It is not in any degree an exaggeration to say that the men living at this time who are more important to the human race than this young gentleman can be counted on the fingers of one hand; perhaps on the thumb of one hand.
Driven by the enormous possibilities his investigations suggested, Tesla lost no time in establishing another laboratory on East Houston Street. He was now able to have tuned devices respond CONJOINTLY by induction from the coil around the experimental area. A very interesting prospect indeed! The question remained, could this condition also be achieved by radio (then wireless telegraphy)? ....
Tesla vigorously addressed the problem as an extension of the experiments performed in his New York City laboratories. He successfully operated a wireless receiver using the conjoint transmission of signals at different frequencies June 27, 1899, as recorded in his notes. So important did he consider the individualization concept and technique that following his return to New York City in January (1900) he instructed Scherff, his secretary and useful man, as a first order of business, to prepare patent applications from the notes kept in Colorado Springs.
The patent application was submitted, but during the period awaiting review, Tesla received notification from the U.S. Patent Office that another patent had been received from Reginald Fessenden on a similar concept and that the office was directing an Interference investigation to determine priority. Depositions were taken in 1902, and the following section is a transcript of those depositions.
In addition to resolving the issue of Tesla's patent application having priority over that of Fessenden, the depositions are of interest today because they disclose not only unavailable information about the development of the invention but as well heretofore unavailable information about experiments performed at Tesla's laboratory in New York City and his experimental station at Colorado Springs.
A discussion and analysis of these disclosures is presented in the section immediately following the Interference transcript.
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