| 释义 |
eˈchometer
Also 8 echometre.
[f. Gr. ἦχο-ς sound + µέτρον measure; in Fr. échomètre (Littré).]
(See quot. 1875.) Also, a type of echo-sounder.
1736Bailey, Echometre. 1875Brande Dict. Science 749 In Music, a sort of scale or rule, marked with lines which serve to measure the duration of sounds, and to ascertain their intervals and ratios. 1881in Worcester. 1937Nature 18 Sept. 499/1 An ‘echometer’ depth sounder. Ibid. 25 Sept. 553/2 Another exhibit..shows how one type of echometer can indicate to a trawler the depth of the sea-bed and also that at which a shoal of fish may be passing. 1961Times 2 June 14/7 Dry-paper recording echometer. |