phonoporen.
/ˈfəʊnəpɔː/, U.S. /ˈfoʊnəˌpɔr/ Telephony. Now historical.
An apparatus incorporating two insulated wires wound together so as to combine features of a capacitor and an induction coil, by means of which a telephone or telegraph circuit could be superimposed on an active circuit without interfering with the current carrying the original transmission.
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society > communication > telecommunication > telegraphy or telephony > telegraphy > telegraph > [noun] > other parts of telegraphs
electric wire1819
pecker1858
sounder1860
motograph1874
contact-point1879
phonopore1885
phonophore1886
separator1891
syntonizer1900
power buzzer1918
1885 Manufacturer & Builder Sept. 207/1 Phonopores can be constructed either so as to permit the sounds to pass unaltered, or so as to alter them in their passage.
1891 C. Langdon-Davies Explan. Phonopore 14 I..called the cable coil instrument a Phonopore (or sound passage).
1892 Pall Mall Gaz. 27 Apr. 7/2 By means of the phonopore..the carrying capacity of the existing telegraph wires can be..increased tenfold.
1929 E. Mallett Telegr. & Telephony viii. 207 If the vibrator is replaced by a microphone circuit simultaneous speech and Morse signalling is obtained. The system is then known as the ‘phonopore’.
1974 Proc. Inst. Electr. Engineers 121 1603/2 Technically, the phonopore was interesting in that it involved a very special kind of transformer, which was not understood at the time.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1885