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<br />- 59' - <br /> <br />NlD) 5 <br />10 <br />I . <br />10 <br /> \ <br />[m-3 mm-J 103 \ <br /> 2 <br /> 10 <br /> 10 <br /> <br /> <br />No= 25000m3mm~ <br />^ = ',21 mm-I <br />R = 3.8 mm/h <br /> <br /> <br />mm <br /> <br />. <br /> <br />\ <br />\ <br /> <br />- <br /> <br />D <br /> <br />Fj~: Raindrop spectra measured on 18 Sept. <br />1969 at 1544 CET (top) and 1549 CET (bottom). <br />The measuring time of the spectra was 1 minute. <br />The numerical values are shown as spectra a and <br />c,. respectively, in Table 3 (from Waldvogel, <br />1974) . <br /> <br />0.1 <br /> <br /> <br />2 <br /> <br />3Enm] <br /> <br />N(D) <br /> <br />I <br /> <br />10$ <br /> <br /> <br />. <br />10 <br /> <br />10 <br /> <br /> <br />No = 2790 m3m m:' <br />^ = 2.19 mm-1 <br />R = 8.\ mm/h <br />Ow= 1,91 m m <br /> <br />[m-3 m m-J 103 <br /> <br />2 <br />10 <br /> <br />0.1 <br /> <br /> <br />2 <br /> <br />3 [mmJ <br /> <br />- <br /> <br />D <br /> <br />5. Instrumentation for rain and snow meaaurements <br /> <br />In any cloud seeding project highly reliable, time-resolved precipitation measuring <br />instruments are required in addition to the simple raingauges which are read only once or <br />twice a day. Such recording precipitatioll gaugEls are commercially available in many dif- <br />ferent designs. It is desirable to have a time-resolution in the measurements of 1 minute <br />and the 24h total should still be available with an accuracy of t 10%. Furthermore, very <br />weak and very large rainfall rates should be rElcorded with about the same accuracy. If pos- <br />sible the gauge should have the standard collecting surface of 200 cm2 in order to allow <br />comparisons with the non-recording gaugea of a meteorological network and finally the in- <br />strument must operate reliably unattended for reasonable periods. A system which fulfills <br />