. Discovery. Science. 12 DISCOVI-HV within range which are adjusted to receive it—the difficulty as regards wave lengths is of course reduced, and some interesting demonstrations on these lines have recently licen given in this country. On one occasion last June, Dame Melba sang into a transmitter at the Marconi Company's station at Chelmsford, and the songs were heard clearly at many wireless receiving stations on land and sea up to distances of several hundreds of miles. It is possible that such a broad- casting system might be utilised for news messages to daily papers, and tests have recen
. Discovery. Science. 12 DISCOVI-HV within range which are adjusted to receive it—the difficulty as regards wave lengths is of course reduced, and some interesting demonstrations on these lines have recently licen given in this country. On one occasion last June, Dame Melba sang into a transmitter at the Marconi Company's station at Chelmsford, and the songs were heard clearly at many wireless receiving stations on land and sea up to distances of several hundreds of miles. It is possible that such a broad- casting system might be utilised for news messages to daily papers, and tests have recently been carried out for the Press Association. These tests, however, were introduced. Even these, however, did not produce radiation of exactly the sort required, and it was undoubtedly the introduction of the Three- Electrode Valve as a generator that gave wireless telephony a fair start. The Three-Electrode Thermionic Valve (Fig. i) con- sists essentially of a vacuum bulb similar to the ordinary incandescent lamp, but with two metallic electrodes inside the bulb in addition to the filament. When this instrument is connected with suitable circuits to a source of electric power, electric oscillations—that is, electric currents oscillating at very high speeds— 'Aeria!. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London [etc. ] Professional and Industrial Pub. Co. [etc. ]
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