Tho. telephone'transmitter patented by Maximilian Weil, of Now 1 ork, is designed to give privacy to communications without tho use of a special cabinet. Tho mouthpiece fits closoly around tho mouth of tho speaker, and a speaking chamber between this and tho diaphragm ha 3 vacuum-jacketed walls. This chamber receives tho spoken message, which sets up vibrations in the diaphragm in tho usual v.'ay without any escape of tho sounds into tho Htm nnr.HTjiod by tho socakor.
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https://paperspast.natlib.govt.nz/newspapers/DOM19131001.2.104.1
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Dominion, Volume 7, Issue 1869, 1 October 1913, Page 9
Word count
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77Page 9 Advertisements Column 1 Dominion, Volume 7, Issue 1869, 1 October 1913, Page 9
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