Updated 14 January 2011

3"/50 (7.62 cm) AA gun manufactured during World War I

3"/50 (7.62 cm) gun on USS Isabel (PY-10)
U.S. Naval Historical Center Photograph # NH 41985

Breech view of the same 3"/50 (7.62 cm) gun as pictured above
U.S. Naval Historical Center Photograph # NH 41984

3"/50 (7.62 cm) gun on USS Isabel (PY-10) about 1933
This is a later model of the 3"/50 (7.62 cm), as shown by the different breech
U.S. Naval Historical Center Photograph # NH 80138

Gunnery practice off the coast of France aboard USS Noma SP-131 during World War I
U.S. Naval Historical Center Photograph # NH 44872

3"/50 wet-mount on USS Swordfish SS-193 in June 1943
Note the special tampion to keep water out of the barrel and the restraining bipod
The white outline reflects a slight placement change
Detail from U.S. Naval Historical Center Photograph # NH 98515

Single 3"/50 (7.62 cm) on USS Lexington (CV-16) about 1998
Photograph copyrighted by Larry Roach

3"/50 (7.62 cm) on display at USS Bowfish Submarine Museum & Park at Pearl Harbor, Hawaii
Photograph copyrighted by Charles Bugajsky

Front view of above gun
Photograph copyrighted by Charles Bugajsky

Close-up of plaque on above gun
Photograph copyrighted by Charles Bugajsky

3"/50 on bow of Netherlands HNLMS Jaguar F822 (ex USS PCE-1609)
Photograph courtesy of Pim van Wijngaarden of HNLMS Jaguar

Cutaway sketch of VT fuzed AA Round
The MT fuzed AA Mark 23 and AA Mark 27 had similar projectile bodies, but used threaded adaptors to hold the nose fuze
Note the sheet steel base cover plate

Cutaway sketch of 3"/50 (7.62 cm) ammunition

31 May 2008 - Benchmark
14 January 2011 - Added cutaway sketch