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Joe Partington taking a morning sun sight
George L
Hubert Paton taking a sun sight
An octant
Captain Nemo taking a star sight from the deck of the NAUTILUS
Octant with simple artificial horizon in the form of a pendulum
Plath sextant
Closeup of coral polyp skeletal composition.
Two coral polyps on a glass slide soon after settlement.
Ragged appearing fathogram trace caused by coral heads
Running up to bank and loosing trace - then heading back out into bay
Unusual specimen of cushion starfish, Culcita novaeguineae, more flatt...
Ship on Nantucket Shoals that was subsequently blown up
Expanded view of fathometer record of remains of ship
Various bottom configurations
Early graphic record from Sub Signal system
"Echometre" record from S
Prototype "portable" depth recorder used as part of 808 fathometer sys...
808 fathometer transducer
Title page to manual - "The Submarine Fathometer"
Sonic sounding apparatus on the GUIDE
Robert Williams with first Fessenden oscillator on the tug Susie D
Shelter and equipment used in reading sounding tubes
Arrangement of sounding machine on PIONEER
Arrangement of sounding machines on PATHFINDER
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