374 EEPOKT NATIONAL ADVISORY COMMITTEE FOB AERONAUTICS TABLE I—Continued AVERAGE SEASONAL AND ANNUAL FREQUENCY OF VISIBILITY LESS THAN 650, 1,000, 3,300, 13,100 AND 23,000 FEET AT CERTAIN STATIONS-Continued GROESBECK, TEX., 7 A. M. i Less than 0.5 per cent. These characteristic differences for… … Fia. 2.—Annual variation in frequencv of visibilities less than Fig. 3.—Annual variation in frequency of visibilities less than 1,600 and 13,100 feet at Royal Center, Ind., and Drexel, Nebr. 1,600 and 13,100 feet at Broken Arrow, OWa., and Groesbeck, Tex. It should be borne in mind that the data…
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