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Section A A index 741-749 of 917 terms
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aspect—The compass direction toward which a land slope faces. The direction is taken downslope and normal to the contours of elevation.
aspirated thermometer—A thermometer for which ventilation is provided by a suction fan.
aspiration condenser—The collecting element in the type of ion counter that uses the method of perpendicular velocities. It consists of a cylindrical condenser that is electrically charged so that the radial field produced will collect the ions from the aspirated air. See Weger aspirator.
aspiration meteorograph—An instrument for the continuous recording of two or more meteorological parameters for which the ventilation is provided by a suction fan.
aspiration psychrometer—A psychrometer in which the ventilation is provided by a suction fan. The aspirator may be driven by a spring or an electric motor. Alternatively, psychrometers with natural ventilation are also in use. See ventilated psychrometer.
aspiration thermograph—A thermograph for which ventilation is provided by a suction fan.
aspirator—A device attached to a meteorological instrument to provide ventilation. In its usual form it consists of a suction fan.
aspre—A northeasterly foehn extending over the Garonne Plain in France, resulting from flow over the Massif Central.
assimilation—See data assimilation.
Assmann psychrometer—A special form of the aspiration psychrometer, developed by Assmann. Two mercury thermometers, mounted vertically side by side in a chromium- or nickel-plated polished metal frame, are connected by ducts to an aspirator. Each thermometer is located inside a pair of coaxial metal tubes, highly polished inside and out, that screen the bulbs from solar radiation.
Middleton, W. E. K., and A. F. Spilhaus, 1953: Meteorological Instruments, 3rd ed., rev., Univ. of Toronto Press, 102–104.
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