Experiment Station Record, Volume 92, January-June, 1945 Page: 12
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12 EXPERIMENT STATION RECORD [Vol. 92
of water evaporated is slight and the temperature of the exhaust air approaches
that of the incoming air. Thus, when the product has a moisture content of about
20.9 percent there is a temperature differential of 43 F., but when the moisture
is reduced to about 6.5 percent the differential is only about 9. It is pointed out
that "this method gives an indication of average moisture content of the whole
mass of material and thus avoids the error due to unrepresentative sampling for
moisture determination. It also eliminates the necessity of frequent sampling and
making moisture determinations in the vacuum oven. Finally, it provides a convenient
means of estimating the moisture content at any stage of the dehydration
Progress in meteorology, D. BRUNT (Roy. Met. Soc. [London], Quart. Jour.,
70 (1944), No. 303, pp. 1-12).-An address summarizing the present state of meteorology,
some of the outstanding problems of the future including the function of
the university in training and research in meteorology, and the Royal Meteorological
Society and the future of meteorology.
Meteorological mileposts, H. A. ZINSZER (Sci. Mo., 58 (1944), No. 4, pp. 261264).
Meteorology in the warring forties: A review, C. CHAPMAN and C. F. BROOKS
(Geog. Rev., 34 (1944), No. 3, pp. 466-475).-A review of 40 books on meteorology
and climatology that have appeared since the war began in Europe.
An approach to quantitative forecasting of precipitation, A. K. SHOWALTER
(Amer. Met. Soc. Bul., 25 (1944), No. 4, pp. 137-142).-The intent of this paper was
to outline technics for estimating the magnitude of rainfall rather than to discuss
general methods for forecasting its occurrence. Enough basic work has now been
done to identify certain meteorological factors significantly related to rainfall
magnitude, the more important of which-surface dew point, wind direction, wind
velocity or pressure differences, and temperature gradients at 5 km.-are considered.
Detailed technics and their reliability are discussed. While the forecaster
is making his analysis of the synoptic situation there should be prepared for him
a detailed chart showing the evaluation of ground conditions, stages of the principal
river, recent rainfall over the basin, course of movement and magnitude of
rainfall areas in adjacent regions, dew points at the surface and temperatures aloft
at key stations, pressures and pressure differences at the surface and selected
upper levels at key stations, stability of air masses in the region, distribution and
changes of distribution of the precipitable water in the general area, and a general
idea of the operational plans for release of water in the area. The next step is
the preparation of the prognostic charts and the actual forecast. The future of
quantitative forecasting appears to lie in prognostic charts of wind, pressure, and
moisture distribution at sea level and 5,000 and 10,000 ft.
Correlation of ground-water levels and precipitation on Long Island, New
York, C. E. JACOB (Amer. Geophys. Union Trans., 24 (1944), pt. 2, pp. 564-573,
illus. 3).-"Long Island simulates in a general way an aquifer in the form of an
infinite strip confined between parallel boundaries at constant head (sea level),
over which recharge from precipitation is assumedly uniform. The nonsteady flow
of water in this idealized system is analyzed, assuming provisionally that the effective
thickness of saturated beds below sea level is great compared to the maximum
height of the water table above sea level. The rate of accretion to the water
table is assumed to vary discontinuously, supposedly being constant for each of the
successive periods (yearly or monthly) and proportional to the average rate of
precipitation during that period. The decay of the water-table profile, beginning
with any one of the succession of superposed nonsteady states, is shown to follow
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/25/: accessed July 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.