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单词 variometer
释义 variometer|vɛərɪˈɒmɪtə(r)|
[f. vari- + -ometer.]
1. An instrument for measuring variations in the intensity of the earth's magnetic field.
1889in Cent. Dict.1916Proc. R. Soc. A. XCII. 321 There can be no question of the enormous simplification of the field work which such a portable variometer produces.1972Nature Physical Sci. 25 Dec. 184/2 Telluric recording equipment was operated in conjunction with a magnetic variometer array.
2. Electr. (a) An inductor (inductor 3 d) whose total inductance can be varied by altering the relative position of two coaxial coils connected in series, and can thus be used to tune a circuit. (b) A device achieving a similar function by means of permeability tuning.
1908C. C. F. Monckton Radio-Telegr. xv. 255 The antenna and the receiving circuit are tuned to the incoming oscillations by means of the variometer.1921Wireless World IX. 6/1 For amateur use the variometer has the advantage that it is cheap compared with a variable condenser.1926‘R. Keverne’ Carteret's Cure vii. 168 Mr. Pell turned to the listening set and picked up the head-phones while his fingers played deftly with the variometer.1959K. Henney Radio Engin. Handbk. (ed. 5) iii. 14 Another form [of variable inductor], which is rather bulky..and now little used, is the variometer... Much more common is the variation of inductance through the variation of the permeability of the core.1977Elektor Mar. 22/1 The variometer is an updated version of the old permeability tuners.
3. An instrument for indicating the rate of climb or descent of an aircraft.
1924Sci. Amer. Feb. 83/2 Air speed indicator... Turn indicator... Variometer.1930Startup & Kinnear tr. Stamer & Lippisch's Gliding & Sail-Planing x. 111 An instrument called a variometer exists for the purpose of indicating ascent and descent and is much used in balloons.1969Daily Tel. (Colour Suppl.) 21 Nov. 64/2 A variometer can confuse you; you might be going down in a rising thermal, so it's no good just knowing how you are doing relative to the air you're in.1973Q. Jrnl. Meteorol. Soc. XCIX. 768 Height changes give a check on the calibration of the variometer.
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更新时间:2024/12/22 18:26:21