NOTES
1. Names or numbers of submarines are listed in bold type with
their builders and dates of completion in ordinary type.
2. Dimensions are overall length, extreme breadth and diameter
of pressure hull. Tonnages are full load displacement
on surface and submerged.
GLOSSARY
OF TERMS Main Ballast
Tanks. (Used to submerge the
submarine). Auxiliary
Ballast Tanks. (Used to trim or adjust
weight of submarine). Torpedo Tube
Tanks. (For filling and emptying
tubes). Oil Fuel
Tanks. (Filled with sea water when fuel is
used). Scale –
Thirty-two feet to the inch.
Main Ballast
Tanks. (Used to submerge the