. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography GRAPHIC REC L R T T. Figure 5. A side-looking sonar system in which sound sources are mounted to project sound laterally from a vehicle towed by a ship to obtain a sonar display of the ocean bottom analogous to an oblique aerial photograph (From Clay et al., 19 64, fig. 1) . Photography The ocean constitutes an effective cover over the continental shelf because light is rapidly attenuated by passage through water and scat- tered by suspended mat
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography GRAPHIC REC L R T T. Figure 5. A side-looking sonar system in which sound sources are mounted to project sound laterally from a vehicle towed by a ship to obtain a sonar display of the ocean bottom analogous to an oblique aerial photograph (From Clay et al., 19 64, fig. 1) . Photography The ocean constitutes an effective cover over the continental shelf because light is rapidly attenuated by passage through water and scat- tered by suspended matter. The amount of light at 100 meters below sea level is a small fraction of that at the sea surface. The continental shelf can be photographed either at extremely close or far ranges but not at intermediate range. Deep-sea cameras operate by illuminating small areas from two to ten square meters of the ocean bottom and se- quentially taking pictures as they are towed within about 5 meters of 768. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories; Environmental Research Laboratories (U. S. ). Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Laboratories : For sale by Supt. of Docs. U. S. G. P. O.
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