Figure 4. Special deep sea camera used by Woods 
Hole Oceanographic Institution from the Research 
Vessel Chain for photographing the Puerto Rican 
Trench at a depth of 20,000 feet. The camera 
features F-4.5 lens stereo cameras mounted side 
by side at the top of the framework, two electronic 
light sources mounted at the bottom of the frame- 
work and a sonar pinger for positioning the camera. 
The framework originally was designed in 1960 by 
Edgerton, Germeshausen & Grier, Inc. for the U.S. 
Navy Hydrographic Office. 
and batteries for the lights on the new assembly 
are inside a separate pressure-proof housing 
which is mounted adjacent to the lights. 
Two of these new F-4.5 lens, 400 watt- 
second, sloping rack, stereo cameras are presently 
on board the Chain en route to the Mediterranean. 
With them it is hoped that pictures will be ob- 
tained 30 feet off the ocean floor covering an 
area of over 500 square feet. 
281 
Figure 5. A photograph taken in June, 1961, in 
the Puerto Rican Trench at a depth of about 
20,000 feet from the Chain using the camera de- 
scribed in the text with 50 watt-seconds at F-4,5 
on plus x film. The white object is a compass 
and flow indicator. Special printing is required 
to show the compass needle. 
BIBLIOGRAPHY 
Photography of The Ocean Bottom, M. Ewing, A. Vine, 
J. L. Worzel. Journal Optical Society of America, 
vol. 36, 1946, pp. 307-321. 
Cameras and Lights for Underwater Use, H.E. Edgerton, 
L. D. Hoadley. SMPTE Journal, July 1955, pp. 345-350. 
Deep-Sea Photography, E. N. Warvey, E. R. Baylor. 
Journal of Marine Research (Sears Foundation), 
vol. VII, No. 1, April 1948, pp. 10-16. 
Submarine Photography with the Benthograph, 
K. O. Emery. Scientific Monthly, vol. 55, No. l, 
July 1952; p, 
A Wide-Angle, Underwater Camera Lens, E.M. Thorndike. 
Journal Optical Society of America, vol. 40, 1950, 
po o2s- 
The High Speed Photography of Underwater Explosions, 
P. M. Fye. SMPTE Journal, October, 1950, 
Underwater Photography, H. Schenck, H. Kendall. 
Cornell Maritime Press, 1954. 
