sid dnd ate Fedh ot Ecole ieeBhdeallied ite A a ee eeeoe Cena ems , Shipboard Observations LAGOON TRAVERSES Lagoon traverses were made on M-boats (LOMs). Water temperatures were measured through making hauls in a canvas bucket, the hauls being made on the windward side of the boat, 1-3 yards to the stern of mid-ship, well forward from the exhaust. Upon completing the haul, the bucket was placed in the shade of the sSteering-house and a thermometer was placed in the water with its bulb at a depth of 6-10 inches and held there until the mercury reached its lowest point. Except where otherwise noted in the Specific Table Notes that follow, the thermometer that was used was a special water thermometer, graduated in tenths of a degree Fahrenheit and mounted on a wooder backing with a perforated brass shield surrounding the thermometer bulb at a distance from the bulb of about 2/2 inch. fully exposed to the water. ‘Thus the bulb was shielded from the sun but was Dry-bulb and wet-bulb air temperatures were obtained from the deck of the boat on the windward side well forward of the exhaust with the instrument shielded from the direct rays of the sun. Except where otherwise noted, observations were made with a psychron (see instrument description under BRUCE, above and whether or not a psychron was used the observations were made at a height of about 5 feet above the deck or a total height of about ll feet above the water. OCEAN TRAVERSES Ocean traverses were made on a crash-boat (AVP), with the observations being made forward, almost to the bow. As in the case of the lagoon observations (see above), water temperatures were obtained through bucket hauls and air temperatures (dry-bulb and wet-bulb) were obtained using a psychron. Air temperatures were taken at a height of about 5 feet above the forward (cockpit) deck, or about 7 feet above the waters USNS T-IST 618 Air temperature observations were from instruments in a louvred shelter on the port bridge wing, at a height of about 30 feet above the water. alcohol-in-glass, though this cannot be checked absolutely. Taylor aneroid located in the chart room. Thermometers were probab. Air pressure was from a It was temperature-compensated in 1954 an corrections during 1954-1958 (inclusive) have not exceeded 0.05 inch. atures were standard intake temperatures. 32 Water temper-