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Numéro d’image : 12022519
| An alidade (archaic forms include alhidade,alhidad,alidad) is an instrument for taking bearings,consisting of two arms revolving around a circular brass plate or dial marked with points and degrees of the compass. It is secures on top of the binnacle hood and set to the ship's course,so that any bearing given by it will represent the magnetic bearing as by the compass beneath. Transparent compass,projection compass is suitable for map work or projection. The compass consists of a case with a needle bearing,a transparent degree scale with the cardinal points,an orienting arrow,a magnetic needle with jewel bearing,and a transparent lid. Azimuth compass a portable,dry card compass provided with sight vanes and used for taking bearings. Azimuth | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / New York Public Library |
| Taille de l’image : | 3580 px × 3186 px |
| Model Release : | Non requis |
| Restrictions : |
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