Compass. A modern Silva-type compass for use in conjunction with a map for finding directions. The Silva compass consists of a fluid-damped,magnetised needle fixed to a plastic ruler base. The north-seeking pole is indicated,with degrees west,south and east,and the needle is free to rotate on a pivot. The needle becomes aligned to the local component of the Earth's magnetic field,resting north to south. From this true north can then be calculated,and orientated to points on a map | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Hart-Davis, Adam |
Bildgröße: | 3613 px × 4961 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |