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July 17 10 8 14544 240 26.7 20.5 240-27 +3:5 0.0 +6.2 +2°7-3'5

Between 15,000 and 16,000 feet.

July 17 10 11 15704 246 22.7 22'0 215 +19 +2·6 +3°3 +0·7 +14 +07

Between 16,000 and 17,000 feet.

July 17 10 15 16914 24°3 19°8 230 20.8 +45 +13 +35-32-10 +2.2 Aug. 18

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July 17 10 25 18844

Between 18,000 and 19,000 feet.

249 244 251 242 +0.5 −0·2 +0.7 −0·7 +0.2 +0.9

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Aug. 18

2 35 18039
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By taking the mean of each column of differences in each 1000 feet of elevation, the next Table is formed.

TABLE X.-Showing the mean differences between the Temperatures of the Dew-point as found by the use of the Dry- and Wet-bulb Thermometers and by Daniell's and Regnault's Hygrometers, and comparison of the results as found from the two Hygrometers.

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