Mechanical Coordinate Converter

In the early 1960s, a computer known as a coordinate converter was part of the instrumentation and equipment used to position the Deep Space Network, or DSN, antennas. This photograph from September 1960 shows a mechanical coordinate converter. The device converted azimuth-elevation position information to hour angle-declination and vice versa. It was able to coordinate two or more tracking antennas that used different coordinate systems for their pointing. It was likely used in early tracking studies of missiles and spacecraft, and as a visual backup for later antenna operations.

Patent US 3163935A lists JPL employee Richard M. Beckwith as the inventor of this instrument. In 1962, Beckwith was a designer with the Guidance and Control Design Group. The photo appears in the photo album for Communications Engineering and Operations, the JPL organization that managed the DSN antennas.

This post was written for “Historical Photo of the Month,” a blog by Julie Cooper of JPL’s Library and Archives Group.


  • Julie Cooper