German submarine U-103 (1940)
German submarine U-103 was a Type IXB U-boat of Nazi Germany's Kriegsmarine that operated during World War II. She was one of the most successful boats in the entire war, sinking 238,944 gross register tons (GRT) of Allied shipping in 11 patrols, in a career lasting more than four years.
U-103 in 1939. Looking backwards from the conning tower. Note the width of casing of the Type IX compared to the Type VII U-boat
The Type IX U-boat was designed by Nazi Germany's Kriegsmarine in 1935 and 1936 as a large ocean-going submarine for sustained operations far from the home support facilities. Type IX boats were briefly used for patrols off the eastern United States in an attempt to disrupt the stream of troops and supplies bound for Europe. It was derived from the Type IA, and appeared in various sub-types.
U-505, a type IXC U-boat
An engine order telegraph dial located in the engine compartment of U-505. "MT" is Maschinen Telegraf, (Telegraph Machine), and "Bb", indicating Backbord, (Port).