Shipping Olympia
QrvERAL devices of- wireless interest were on display at the recent i" Shipping Exhibition at Olympia. Ay, recently invented receiver which automatically gives the alarm when distress messages are received from ships in trouble occasioned much interest. Another noteworthy device exhibited was the Laryngaphone noise-exclud-ing telephone, which enables conversations to be carried on without interruption from the noisiest engine room. The microphone of the instrument is * ‘applied to the neck or cheek of the speaker, being actuated by the vibrations of the vocal chords.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291129.2.36
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Radio Record, Volume III, Issue 20, 29 November 1929, Page 8
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86Shipping Olympia Radio Record, Volume III, Issue 20, 29 November 1929, Page 8
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