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sphygmophone
sphygmophone n.
Brit. 
/ˈsfɪɡmə(ʊ)fəʊn/
, /ˈsfɪɡmə(ʊ)fəʊn/U.S. /ˈsfɪɡməˌfoʊn/
an instrument by which pulsations are rendered audible./ˈsfɪɡməˌfoʊn/ΘΠ
the world > physical sensation > hearing and noise > audibility > sound magnification or reproduction > [noun] > other amplifying devices
micracoustic1684
microphone1684
polyacoustic1684
resonator1864
resonance cavity1867
resonance chamber1870
aerophone1878
megaphone1878
sphygmophone1879
phonendoscope1895
auxetophone1904
stentorphone1921
1879 B. W. Richardson in Proc. Royal Soc. 29 70 The Sphygmophone.
1889 H. E. Handerson tr. J. H. Baas Outl. Hist. Med. 1016 It has been combined with an electric chime of bells (sphygmophone) of Upham.
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