This instrument is said to have been used by Richard E. Byrd, USN, during his flight to the North Pole on May 9, 1926. It consists of two mercury-in-glass thermometers mounted on an aluminum frame with a wooden handle. The inscriptions on the frame read "H. J. GREEN B'KLYN N.Y." and "No. 648 U.S. WEATHER BUREAU" and "8078" and "8079". The wet bulb thermometer has a milk white back; its clear front is marked "U.S. 8078" and graduated every degree Fahrenheit from -40 to +129. The dry bulb thermometer has a milk-white back; its clear front is marked "U.S. 8079" and is graduated every degree F from -40 to +129.
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