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<br />SECTION 9. - HYGROTHERMOGRAPH <br /> <br />A hygrothermograph was operated in a small non-standard weather shelter about 4 <br />feet above roof level on the south corner of the G.M.O. (Grand M!esa Observatory) <br />mobile home. The unit was operated from November 1, 1983 through March 31, <br />1984. No hair element was available till November 15. In mid-February the <br />trace from the hair element abruptly shifted and, thereafter, diurnal variations <br />were less than expected. The reason for thi s is not known. A further' compro- <br />mise of the data, both temperature and humidity, is due to frequent partial <br />filling of the weather shelter by blowing snow. <br /> <br />The purpose of the hygrothermograph was to "backstop" the temper,ature and <br />dewpoint temperature (EG&G system) data recorded through the PROBE system. As <br />the latter were reliable, there are no plans to red~ce the hygrothermograph data <br />except where important gaps (if any) in the EG&G data exist. <br /> <br />Several Assmann psychrometer checks were made duri n9 the course of the wi nter at <br />the same hei ght, and inclose proximity to, the hygrothermograph and EG&G <br />sensing head. These are available to calibrate the hygrothermogr'aph if needed. <br /> <br />9-1 <br /> <br />~. J.. <br />