Map wheel. This device is used to measure out distances on a map. The route is traced using the wheel,which moves the pointer (top centre). The distance traced is read out from the dial. This is then converted into the real distance by using the scale provided with the map | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Horrell, Steve |
Taille de l’image : | 4788 px × 3670 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |