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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-