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Updated: May 22, 2025
"Not for a little time yet, anyway," grinned Bob. "The government hasn't been after us yet begging us to take jobs in the radio department." "You never can tell," replied Brandon. "There's a big demand for radio men these days, and we're getting some pretty young chaps in our division." "We don't feel as though we'd much more than scratched the surface of radiophony yet," said Joe.
In an order of ideas different in appearance, but closely linked at bottom with the one just mentioned, must be recalled the discovery of radiophony in 1880 by Graham Bell, which was foreshadowed in 1875 by C.A. Brown. A luminous ray falling on a selenium cell produces a variation of electric resistance, thanks to which a sound signal can be transmitted by light.
"It looks to me as though radiophony were only just starting at present, and it seems certain that it offers a big field for any one who has the desire and ability to take up that line of work. It may turn out to be a fine thing for them later on." "I suppose that's very true," said his wife, thoughtfully. "Although that side of it never occurred to me before."
The boys read every word of the letter, and were more than ever impressed by the wonderful possibilities of radiophony. No longer would it be necessary for an exploring expedition to be lost sight of for months, or even years.
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