u/Arde645

First image from the 1932 June edition of "Modern Mechanics and Inventions", detailing the testing and "success" of a coilgun from British inventors.

Second image from the 1936 November edition of Popular Science detailing an electromagnetic machinegun from Texas.

Third image onwards from the Bundesarchives detailing tests from 1945 for an electromagnetic anti-air gun capable of propelling rounds at 2km/s.