Located on the floor of the Instrument Shelter; continuous recording of the air temperatures by means of a bimetallic chamber attached to a pen arm; calibrated against U.S.N.W.S. Official Maximum and Minimum Air Temperature thermometers; clock-driven; presently on a 7-day sequence ó changed each Monday; indicates times of maximum and minimum air temperatures; illustrates daily "march" of air temperatures. Human hair hygrometer measures amount of humidity by changing length of hair bundle. (Lengthens with increased humidity)

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