tachometern.
/taˈkɒmɪtə/ a. An instrument by which the velocity of machines is measured; spec. one that indicates the speed of an engine in r.p.m.
ΘΚΠ
society > occupation and work > equipment > machine > [noun] > instrument measuring speed or motion of machine
tachometer1810
oscilloscope1922
the world > movement > rate of motion > [noun] > in the physical sciences > measurement of > instrument
tachometer1810
velocimeter1842
velocity-measurer1850
tack1963
tacho1964
tach1966
the world > matter > physics > mechanics > dynamics > [noun] > speed or direction as vector quality > device to measure or record velocity
ballistic pendulum1764
tachometer1810
velocimeter1842
velocity-measurer1850
gun-pendulum1867
1810 Donkin in Trans. Soc. Arts 28 185 An instrument of my invention for indicating the velocity of machines, and which may not improperly be called a Tachometer.
1825 ‘J. Nicholson’ Operative Mechanic 42 The method of putting the tachometer in motion whenever we wish to examine the velocity of the machine.
1918 Bull. U.S. Naval Consulting Board No. 3. 10 Many new instruments have been devised for aircraft. These include..tachometers, which indicate the engine speed.
1953 C. A. Lindbergh Spirit of St. Louis ii. vi. 187 The tachometer needle shows 1825 r.p.m.
1975 Drive New Year 88/1 This is an important job performed by the rev-counter, or tachometer.
b. An instrument for measuring the velocity of a moving body of water, a current-measurer.
ΚΠ
1864 Webster's Amer. Dict. Eng. Lang. Tachometer,..(b.) an instrument for measuring the velocity of running water in rivers, canals, &c.
1875 L. D'A. Jackson Hydraulic Man. i. 84 The tachometer of Brünings is the best instrument of this type.
Compounds
tachometer generator n. = tacho-generator n.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > generator > [noun] > tacho-generator
tachometer generator1946
tacho-generator1952
1946 Shell Aviation News No. 103. 24/1 The gearbox is of Rolls-Royce design... It is mounted on the bulkhead and provides drives, on the forward side, for the air pump and the generator, and on the rear side for the tachometer generator.
1958 W. D. Cockrell Industr. Electronics Handbk. ii. 254 Tachometer generators are used in systems to generate feedback signals in servoloops or used directly with an indicating instrument.
Derivatives
taˈchometry n. the scientific use of a tachometer; the measurement of velocity.
ΘΚΠ
the world > movement > rate of motion > [noun] > in the physical sciences > measurement of
tachometry1891
velocimetry1969
1891 Cent. Dict. Tachometry.
tachoˈmetric adj.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > generator > [adjective] > relating to tacho-generator
tachometric1931
1931 S. R. Roget Dict. Electr. Terms (ed. 2) 341/1 Tachometric electrometer.
1967 O. I. Egerd Control Syst. Theory vii. 238 Tachometric feedback.
This entry has not yet been fully updated (first published 1910; most recently modified version published online March 2022).
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