Rolling Disc Planimeter (30764633162)
Summary
Cartographers used this German-made device to accurately measure the size of an area on a map or plan by tracing the area’s outline. The area calculation used the resulting dial reading.
Tags
cia
central intelligence agency
map drawing instruments
intelligence
maps
ultra high resolution
high resolution
Date
09/11/2016
Source
Rolling Disc Planimeter
Link
Copyright info
Public Domain