† opeidoscopen.

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ὀπ- , ὄψ , εἶδος , -scope comb. form.

Etymology: < ancient Greek ὀπ-, ὄψ voice ( < the same Indo-European base as classical Latin vōx voice n.) + εἶδος form, image (see eidos n.) + -scope comb. form. N.E.D. (1903) gives the pronunciation as (opəi·dŏsko^up) /əʊˈpaɪdəskəʊp/.

Obsolete. rare.

A particular instrument invented for giving a visual representation of sound.The instrument consists of a tube closed at one end by a taught membrane with a small mirror attached to its centre, which vibrates in response to sound entering the tube at the open end, thereby causing a spot of light reflected by the mirror on to a screen to vibrate with varying amplitude and frequency according to the intensity and frequency of the sound.

ΘΚΠ

the world > matter > physics > science of sound > vibration > instrument for analysing vibration > [noun]

sonometer1802

siren1822

sirenea1830

opeidoscope1873

flame manometer1875

manometric capsule1879

wave-siren1881

pitch meter1947

1873 A. E. Dolbear in G. B. Prescott Speaking Telephone (1879) 262 While engaged in making a manometric flame capsule, I invented the opeidoscope.

This entry has been updated (OED Third Edition, June 2004; most recently modified version published online September 2019).

单词	opeidoscope
释义	† opeidoscopen. Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ὀπ- , ὄψ , εἶδος , -scope comb. form. Etymology: < ancient Greek ὀπ-, ὄψ voice ( < the same Indo-European base as classical Latin vōx voice n.) + εἶδος form, image (see eidos n.) + -scope comb. form. N.E.D. (1903) gives the pronunciation as (opəi·dŏsko^up) /əʊˈpaɪdəskəʊp/. Obsolete. rare. A particular instrument invented for giving a visual representation of sound.The instrument consists of a tube closed at one end by a taught membrane with a small mirror attached to its centre, which vibrates in response to sound entering the tube at the open end, thereby causing a spot of light reflected by the mirror on to a screen to vibrate with varying amplitude and frequency according to the intensity and frequency of the sound. ΘΚΠ the world > matter > physics > science of sound > vibration > instrument for analysing vibration > [noun] sonometer1802 siren1822 sirenea1830 opeidoscope1873 flame manometer1875 manometric capsule1879 wave-siren1881 pitch meter1947 1873 A. E. Dolbear in G. B. Prescott Speaking Telephone (1879) 262 While engaged in making a manometric flame capsule, I invented the opeidoscope. This entry has been updated (OED Third Edition, June 2004; most recently modified version published online September 2019). < n.1873
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