Image of the day

From an issue of Popular Science, July, 1946.

The “co-graph� 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. The co-graph obtains direction by being oriented with a 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 body.

Via modern mechanix.