A short well-illustrated piece concerning the early 1940s innovations in fighter-plane ammunition. The article goes into some detail concerning tracer bullets and the time fuse.
US Army Air Corps fighter-plane ammunition of WW2tracer bullets invented for WW2time-fuse weaponry created for WW2
US Army Air Corps fighter-plane ammunition of WW2tracer bullets invented for WW2time-fuse weaponry created for WW2