. Compendium of meteorology. Meteorology. 1228 METEOROLOGICAL INSTRUMENTS some quantity related to M. Such instruments should be more widely used. SPECIAL RESEARCH INSTRUMENTS Obviously, there are meteorological quantities other than temperature, humidity, pressure, wind velocity, and liquid-water content which are important for par- ticular studies, and in some cases for general meteor- ological use. Some research programs have required very extensive aircraft instrumentation, and many in- genious instruments have been devised [10]. Figure 3 52 54 S 56 CD Q 58 60 62 o. 0 u +3 + I 0 0.
. Compendium of meteorology. Meteorology. 1228 METEOROLOGICAL INSTRUMENTS some quantity related to M. Such instruments should be more widely used. SPECIAL RESEARCH INSTRUMENTS Obviously, there are meteorological quantities other than temperature, humidity, pressure, wind velocity, and liquid-water content which are important for par- ticular studies, and in some cases for general meteor- ological use. Some research programs have required very extensive aircraft instrumentation, and many in- genious instruments have been devised [10]. Figure 3 52 54 S 56 CD Q 58 60 62 o. 0 u +3 + I 0 ? E "â 0 MILES FROM ALONG AZIMUTH OF 134 DEGREES 40 38 36 34 32 30 28 26 24 22 20 RADAR ECHO INTENSITY g METER TEMPERATURE- WET BULB LESS WET CORRECTION LIQUID WATER CONTENT M M,. I2'53 12-54 L ^ 1256 12-57 I2;58 12:59 TIME 13:00 13:01 13:02 Fig. 3âAn atmospheric cross section and plot of instru- ttiental measurements and observations, most of which were obtained from a B-17. At the top is a plot of radar echo in- tensity (DBM = decibels below one milliwatt) from the storm; next are recorded vertical accelerations; then temperature records, liquid water contributed by cloud and by rain, and a vertical cross section along the flight path constructed from radar information as well as direct observations. The flight was at a level where snow was melting to rain, creating a stratified radar echo as shown by the heavy slant hatching. (Courtesy of Signal Corps Weather Radar Research at ) presents in chart form some of the measurements ob- tained with equipment designed for measurements as- sociated with the uses of radar in meteorology [7]. Aircraft icing studies have also required many special- ized instruments. Only a few can be mentioned here. Cloud and Raindrop Size. A small cloud drop may be only 5 m in diameter, a large raindrop 5000 m- So wide a range of sizes requires quite different tech- niques of measurement. In both cloud and rai
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