TELEPHONING BY LIGHT
» LIMITLESS OI'PORTUNI TIES OFFERED BY SUNLIGHT. (iiec. January 11, 5.5 p.m.) London, January 8. Professor Rankine gave a demolish' tion of telephoning by light. The trail mission instrument is a photophone, wil a eramonhone sound-box, a delicate! nosed mirror replacing the needle. Tl effect of light upon tho element scleiiiu. causes the mirror to convey the soui oscillations received • Professor Rntikit states that sunlight offers limitless oi portunities for transmission of speec always allowing for the earth's curv. t.ure.—"The Times."
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Dominion, Volume 13, Issue 90, 10 January 1920, Page 7
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83TELEPHONING BY LIGHT Dominion, Volume 13, Issue 90, 10 January 1920, Page 7
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