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Australian Device Makes Maps Of the Ground It Covers
The odd apparatus at left is the Australian “co-graph,” which automatically maps the ground over which it moves. Named for its inventor, Lt. Col. H. J. F. Coe, the machine can be operated by a pedestrian or set up in a trailer (PSM, Dec. ‘44, p. 134). The co-graph obtains direction by being oriented with a sensitive compass; gets distance from a calibrated ground wheel. Drive from the wheel turns a paper-carrying roller under a fixed pencil, and thus a course is plotted to scale. The co-graph’s upper part —sighting tube, compass, mirror, and map-making equipment—weighs only 10 pounds and is strapped to the user’s body.
Via Modern Mechanix.