| 释义 |
pelorus|pəˈlɔərəs|
Also Pelorus.
[Name of the supposed pilot of Hannibal when he left Italy.]
A compass rose equipped with one or two sighting arms, used for taking the relative bearings of sighted objects.
1854Friend & Browning Brit. Pat. 2652 This invention has for its object the construction and use of an instrument or apparatus which we denominate a pelorus, for determining the amount of magnetic aberration occasioned by local attraction in ships or vessels of every description,..and by the use of which..the true course..may be from time to time accurately ascertained. 1881S. T. S. Lecky ‘Wrinkles’ in Pract. Navig. x. 67 Having a Pelorus, the first thing to do is to provide suitable stands for it in various parts of the ship, so that it may be moved from one to the other as may be found convenient. 1904Wilson-Barker & Allingham Navigation (ed. 2) iii. 17 For the purpose of obtaining bearings when the object is not visible from the standard compass..a Pelorus is very useful. 1934J. Irving Navig. Small Yachts 284 As the ship's head is steadied on a point by the steering compass the bearing of the distant object is noted by the ‘pelorus’, and this bearing angle (from right ahead) is applied to the compass direction of ship's head. 1943Redpath & Coburn Air Transport Navig. iv. 63 A pelorus (a dummy compass rose equipped with sighting vanes) is usually mounted on top of the hatch above the cockpit in the airplane. 1973Country Life 27 Nov. (Suppl.) 66/2 Mid 18th century French brass Pelorus... With original travelling case. |