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<br />. <br /> <br />24 <br /> <br />. <br /> <br />further modifications. The most significant change is the repositioning of the <br />hot wire anemometer to the pipe connecting the ice crystal suspension tunnel <br />with the vacuum cleaner. The repositioning satisfactorily eliminated any <br />influence of impacting fog droplets since most of these droplets were filtered <br />out in the suction chamber. Even though the flow speed near the crystal <br />differed from that in the pipe, a predetermined conversion factor <br />compensated for the difference. Also, the pitot tube arrangement, positioned <br />above the suction chamber, helped check the accuracy of the anemometer and <br />the two instruments varied by no more than 4 percent of the flow speed. <br />There were a few more but relatively minor changes and additions made <br />in this study. One change is the calculation of the c-axial length for thin <br />plates by using the estimated coverage area of the basal plane, the bulk density <br />of ice ( assumed to be 0.917 g / cm3 ) and the ice crystal mass. An improvement <br />in the experimental results is the reporting of some experimental errors, <br />which included slow temperature rises of 0.4 to 1.60C during the growth <br />period and an uncertainty in the fall speed of:t3 em/so <br />The experimental results also consisted of the ice crystal mass, a- and <br />c-axiallengths, and fall speed at temperature between -4 and -IT'C after a 5, 10, <br />15,20,25 or 30 minute growth period. The liquid water content was missing <br />as well as some of the dimensional data after 20, 25 and 30 minutes of growth <br />where rimed crystals made the measurements difficult. However, because <br />nearly all of the major problems associated with experimental techniques <br />were eliminated, this study produced reliable data. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Comparisons and Analysis of the Data Sets <br />As shown previously in this chapter, different techniques and <br />equipment resolved many problems encountered during each investigation. <br /> <br />. <br />