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 dista

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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.

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Size: 4788px × 3670px
Photo credit: © STEVE HORRELL/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: cartography, device, distance, distances, equipment, geographical, geography, instrument, map, mapping, measurement, measurements, measuring, orienteering, scale, scales, science, scientific, surveying, tool, wheel