Wireless Telegraphy - Commentary

In your interesting article on this subject in your issue for the 8th inst., you say: "We think there can be no doubt that Marconi is the true and first inventor of the elevated electrodes on the receiver and transmitter."

In a book entitled "The Inventions, Researches and Writings of Nikola Tesla," published early in 1894, pages 346 — 9, will be found much interesting matter with regard to what is therein termed "the transmission of intelligible signals, or perhaps even power, to any distance without the use of wires." In particular, an arrangement of transmitter and receiver, each connected with one terminal to earth, and with the other terminal to an insulated body of large surface, shown in a diagram as elevated above the earth, is suggested for the purpose of what is indexed as "telegraphy without wires."

Without in any way desiring to detract from the credit that is due to Mr. Marconi for the results that he has obtained, I think that it is only fair to Mr. Tesla that attention should be called to the above.

A. A. C. Swinton.