WIRELESS SIGNALLING
INVENTION THAT MAGNIFIES : SOUND WAVE A JfIUJON TIMES. - < The use of wireless telegraphy and telephony was explained recently by the wellknown expert from America, Dr. I-ee do Forest, who has recently arrived m Jyon<ion.. His chief' invention, the Midwn lamp, is in use all over the world. Its function is to receive-and amplify the . sound waves, which by its means can he magnified l a''million times without affecting tlieir tonal qualities. , "All the United States airplanes, said Dr. do Forest, "are now fitted with this < apparatus, which has made it possible , for the 'pilot to receive a message in the air despite the noise, of his engine. Our " signal corps, too, in the trenches are using the same apparatus of a more portable kind, and they have an effective range of from four to five miles, bim"ply bv moving ft switch the apparatus ■can lie used for either' telegraphic or telephonic work."
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https://paperspast.natlib.govt.nz/newspapers/DOM19190107.2.75.5
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Dominion, Volume 12, Issue 87, 7 January 1919, Page 8
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154WIRELESS SIGNALLING Dominion, Volume 12, Issue 87, 7 January 1919, Page 8
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