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| | Ships of the World: An Historical Encyclopedia - - Bathysphere (Site not responding. Last check: 2007-10-25) |
 | | Because pressure increases by 14.7 pounds per square inch for every 33 feet in depth, the observation platform had to be strong, compact, and round, to distribute the pressure evenly. |
 | | Five days later Bathysphere went down to 1,426 feet, and on August 15, 1934, reached 3,028 feet, the extreme limit of the tether. |
 | | The last dives in the Bathysphere were completed in 1934, and comparable depths were not attained until after World War II, when August Picard developed the first self-propelled bathyscaph ("deep boat"), Trieste. |
| college.hmco.com /history/readerscomp/ships/html/sh_010100_bathysphere.htm (296 words) |
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