Variscale
A variscale is variable length mechanical scale (ruler) designed to directly measure latitude and longitude on USGS maps.
A variscale is variable length mechanical scale (ruler) designed to directly measure latitude and longitude on USGS maps.
A variscale is variable length mechanical scale (ruler) designed to directly measure latitude and longitude on USGS maps.
Source: Wikipedia "Variscale" · CC BY-SA 4.0
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