phototachometern.

Brit.

/ˌfəʊtəʊtaˈkɒmᵻtə/,

/ˌfəʊtəʊtəˈkɒmᵻtə/, U.S.

/ˌfoʊdoʊˌtæˈkɑmədər/,

/ˌfoʊdoʊtəˈkɑmədər/

Origin: Formed within English, by compounding. Etymons: photo- comb. form, tachometer n.

Etymology: < photo- comb. form + tachometer n. Compare slightly earlier phototachymetrical adj.

1. Physics. An apparatus for measuring the speed of light. Now rare.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > speed of light > instrument for measuring

phototachometer1884

1884 Science 16 May 588/2 A re-determination of the velocity of light by the phototachometer.

1886 Athenæum 3 July 21/1 An account of Prof. Newcomb's determination..of the velocity of light. The apparatus employed, to which the name of ‘phototachometer’ was given.

1902 Science 18 July 82/1 The very accurate results..of Newcomb with his highly refined phototachometer in this country.

2. An optical device for measuring the speed of rotation of a part.

ΚΠ

1973 Electrochimica Acta 18 294/2 Accurate and rapid measurement of rotation rate was achieved with a digital counter activated by a photo-tachometer.

1983 Science 16 Dec. 1182 (advt.) [A centrifuge] Unique see-through lid—you see the rotor in operation and can easily..verify speed with a phototachometer.

2001 Business Wire (Nexis) 29 Nov. A phototachometer to measure the rotational rate of the vehicle's driveshaft.

This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).

单词	phototachometer
释义	phototachometern. Brit. /ˌfəʊtəʊtaˈkɒmᵻtə/, /ˌfəʊtəʊtəˈkɒmᵻtə/, U.S. /ˌfoʊdoʊˌtæˈkɑmədər/, /ˌfoʊdoʊtəˈkɑmədər/ Origin: Formed within English, by compounding. Etymons: photo- comb. form, tachometer n. Etymology: < photo- comb. form + tachometer n. Compare slightly earlier phototachymetrical adj. 1. Physics. An apparatus for measuring the speed of light. Now rare. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > speed of light > instrument for measuring phototachometer1884 1884 Science 16 May 588/2 A re-determination of the velocity of light by the phototachometer. 1886 Athenæum 3 July 21/1 An account of Prof. Newcomb's determination..of the velocity of light. The apparatus employed, to which the name of ‘phototachometer’ was given. 1902 Science 18 July 82/1 The very accurate results..of Newcomb with his highly refined phototachometer in this country. 2. An optical device for measuring the speed of rotation of a part. ΚΠ 1973 Electrochimica Acta 18 294/2 Accurate and rapid measurement of rotation rate was achieved with a digital counter activated by a photo-tachometer. 1983 Science 16 Dec. 1182 (advt.) [A centrifuge] Unique see-through lid—you see the rotor in operation and can easily..verify speed with a phototachometer. 2001 Business Wire (Nexis) 29 Nov. A phototachometer to measure the rotational rate of the vehicle's driveshaft. This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022). < n.1884
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