. Commercial fisheries review. Fisheries; Fish trade. Fig. 3 - The bathysphere can be lowered and raised with the trawling winches, cables, and gantry that are permanently installed aboard the 215-foot Miller Freeman, the Seattle Biological Laboratory's research vessel. October 8, 1969. The various safety devices and life-support systems of the bathysphere were tested. All systems functioned accord- ing to design. There were additional tests to determine the ability of observers to recognize objects of unknown size and to estimate the distance of various objects from the bathysphere. The resul
. Commercial fisheries review. Fisheries; Fish trade. Fig. 3 - The bathysphere can be lowered and raised with the trawling winches, cables, and gantry that are permanently installed aboard the 215-foot Miller Freeman, the Seattle Biological Laboratory's research vessel. October 8, 1969. The various safety devices and life-support systems of the bathysphere were tested. All systems functioned accord- ing to design. There were additional tests to determine the ability of observers to recognize objects of unknown size and to estimate the distance of various objects from the bathysphere. The results showed that each of four observers tended tounderestimate both the size and the distance of objects from the bathysphere. Another test at Manchester was designed to determine underwater viewing capability from the bathysphere. It showed that the cone of vision through the view ports decreased from about 120° when the bathysphere was above the surface to about 90°underwater. An example of the underwater view through one of the 12-inch ports is shown in figure 4. There was variation caused by the diameter of the viewports; alsOj the cone of vision varies accordingtothe porthole used because the arrangement of instruments restricts observer's ability to place his eyes close to the inside surface of some portholes. Since the portholes tested were in favorable loca- tions, a 90° cone of vision probably is the maximum attainable viewing capability. The 16 viewports spaced around the bathysphere provide a good view in all Fig, 4 - Sea anemones (Metridium) attached to concrete blocks as observedat a depth of 40 feet from one of bathysphere's 12- inch 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 United States. National Marine Fisheries Service; U. S. Fish and Wildlife Service; United
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