| 单词 | station pointer |
| 释义 | > as lemmasstation pointer station pointer n. Nautical an instrument for locating the position of the observer on a map or chart by measuring the two angular separations of three objects of known positions.A station pointer typically consists of a circular scale marked in degrees at the centre of which are pivoted three arms, one fixed and two adjustable. The two adjustable arms are set to the two measured angles, and then placed on a map with the three arms passing over the three objects; the centre is then the observer's position on the map. ΘΚΠ the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > for finding observer's position station pointer1774 station finder1853 pointer1875 1774 M. Mackenzie Treat. Maritim Surv. 24 Such an Instrument as this may be called a Station-pointer. 1858 W. D. Haskoll Pract. Engin. Field Work xiii. 189 In the absence of a station pointer, we may lay down the two angles on a piece of tracing paper, and produce the lines to a sufficient length. 1902 Encycl. Brit. XXXIII. 97/2 The ‘station-pointer’ is the instrument used in plotting fixes. 2008 M. S. Monmonier Coast Lines vi. 71 An appropriate projection lets the navigator read distances and bearings directly from the chart as well as fix a vessel's position with a sextant and station pointer. < as lemmas |
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