TABLE 3. FRED: NAUTICAL MILES OF WIND (NOON TO NOON, 180TH MERIDIAN). The low level anemometer was at the same height as those on BRUCE and KEITH. During the first Intensive Phase of the study (August-September, 1957) these three anemometers were compared both before and after the 2-week observational period. Comparisons were made through | Renn Ce ee le ee mounting each anemometer on a 6-foot pole and placing these along the beach on EIMER, with me anemometers aligned up~beach one from the other at successive distances of about 10 feet. anemometers were rotated as to position and the total values were compared. allotted for each comparative rune The Results of the inter-calibrations, before and after the observational period, were as follows (in percent of wind totals): BEFORE: FRED and KEITH anemometers agreed consistently within 4%, with the FRED anemometer consistently the higher. BRUCE anemometer consistently the lowest of the three, with the values ranging from 25-33% of the mean of FRED and KEITH. AFTER: FRED consistently higher than BRUCE by 1-2%. KEITH consistently 2-15% lower than the mean ofFRED and BRUCE. After the second calibration run, it was discovered that a nut had fallen into the housin of the KEITH anemometer. When this occurred is not known. During the second Intensive Phase (January-February, 1958) there was no low-level anemometer at FRED, since it was found that one of the three totalizing anemometers was broker and it was decided to retain the wind measurements on BRUCE and KEITH, rather than FRED. Circumstances did not permit making calibration runs prior to this second observational peria but runs made afterward showed that the BRUCE and KEITH anemometers agreed within 10%. It is not known which, if either, anemometer was consistently higher. NOTE: This comparative table for FRED may permit an estimate of low-level wind conditic: during the second Intensive Phase through reducing the wind readings at the FRED tower (high level) by a factor of 22%. It should be noted, however, that Table 3 shows a general tendenc for closer agreement between the high and low anemometers when winds are higher than when win are lower; and since winds were decidedly higher during January-February than during August- September, this reduction coefficient should probably be decreased sanewhat. 34 i 5-6 hours was ’