Published Resources Details Letters Patent
- Submarine boat
- United States Patent Office, 605
Specification forming part of Letters Patent No. 681,221. Application filed September 27 1900.
"This invention relates to diving or submarine boats; and the object of the invention is to provide means to control automatically the depth to which the boat shall descend in order to avoid the risk of injury from striking the bottom of the waterway and from the hydrostatic pressure encountered at too-great depths."