United States of America
4"/40 (10.2 cm) Marks 1, 3, 4, 5 and 6
4"/39 (10.2 cm) Mark 2
Pictures

Updated 16 August 2007


WNUS_4-40_mk1_Philadelphia_crew_pic.jpg

4"/40 (10.2 cm) gun crew on S.S. Philadelphia in June 1917
Note the "layered" built-up barrel and the central pivot mounting, with special attention to the training gear
Unidentified merchantman in the background appears to mount two 5" (12.7 cm) guns
U.S. Naval Historical Center Photograph # NH 41711


WNUS_4-40_mk1_Sacramento_pic.jpg

4"/40 (10.2 cm) gun on USS Sacramento PG-19 in February 1939
Note the differences between this later gun barrel and mounting compared to the earlier weapon pictured above
The officer in the center is LtJG. John D. Bulkeley who was awarded the Medal of Honor during World War II
U.S. Naval Historical Center Photograph # NH 84944

WNUS_4-40_mk1_Findland_pic.jpg

4"/40 (10.2 cm) on USS Finland ID # 4543 about 1918
Detail from U.S. Naval Historical Center Photograph # NH 53907

WNUS_4-40_mk1_Findland_crew_pic.jpg

Gun crew of 4"/40 (10.2 cm) on USS Finland ID # 4543 about 1918
Note the "bottleneck" fixed ammunition and that this mounting has a gunshield while the ones above do not
U.S. Naval Historical Center Photograph # NH 103303