deriˈvometer
(dɛrɪˈvɒmɪtə(r))
[a. F. dérivomètre, f. dériver to drift (see derivation2) + -ometer.]
An instrument invented to show a ship's lee-way.
| 1842 Mech. Mag. XXXVII. 84 Another invention of M. Clement's, which he calls a Derivometer, is an instrument to ascertain a ship's leeway..When at anchor, the instrument will show clearly the direction of the currents. 1928 Times 15 Aug. 13/6 The afterpart of the cabin..contained the derivometer for measuring the airship's deviation from the straight course. |