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<br />4. ANALYSIS PROCEDURES <br /> <br />4.1 Ice Crystal Reduction <br /> <br />The replica tor films for the 22 storms were reduced by four data tech- <br /> <br /> <br />nicians who were completely ~nfamiliar with cloud physics or the effects <br /> <br /> <br />of weather modification. The technicians were trained in the general <br /> <br /> <br />background of ice crystal physics and the importance of a careful, <br /> <br />detailed data reduction. They were not told which storms were seeded. <br /> <br />The ice crystals were classified into five categories - plates, columns, <br /> <br />dendrites, irregulars, and graupel. Figure 9 shows the five classifi- <br /> <br />cations used as a standard in the reduction. Due to riming andfragmen- <br /> <br />tation the majority of crystals fell into the irregular and graupel <br /> <br />categories. <br /> <br />Figure 10 shows examples of the four rime categories used - none, light, <br /> <br />moderate, and heavy. These photographs from Magono and Lee (1966) along <br /> <br />with the classification scheme in the previous paragraph were used regularly <br /> <br />by the technicians to maximize uniformity in the reduction. <br /> <br />In addition to the crystal type and rime classifications, each crystal <br /> <br />was measured for size to the nearest 100 microns. The maximum dimension <br /> <br />~as used and called the crystal diameter. Particles less than 50 microns <br /> <br />were not counted as ice crystals because it was impossible to distinguish <br /> <br />a crystal less than 50 microns from the nap on the black velvet belt. <br /> <br />-24- <br />