declinometer Magn.
(dɛklɪˈnɒmɪtə(r))
[irreg. f. as prec. + -meter, Gr. µέτρον measure.]
1. Magn. An instrument for measuring the variation of the magnetic needle.
| 1858 in Simmonds Dict. Trade. 1870 R. M. Ferguson Electr. 19 Instruments for determining magnetic declination are called declination needles or declinometers. 1881 Maxwell Electr. & Magn. II. 112 The declinometer gives the declination at every instant. |
2. Astr. An instrument for observing and registering declination.
| 1883 D. Gill in Encycl. Brit. XVI. 255 Bond's mica declinometer. |