Page:Popular Science Monthly Volume 36.djvu/327

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In the chart which I have referred to, I have compared the relative humidity of the atmosphere at New London, Conn., with that of Augusta, Ga., from General Greely's tables, and I have added the data of New Bedford, Mass., from the private records which have been kept for a very long period by Mr. T. R. Rodman and his father. I have also compiled some data relating to Atlanta, Ga.

The general results derived from these two charts prove that the mean temperature of Atlanta is 12° Fahr. above that of New London, with 13 less per cent of relative humidity, and subject to a vastly greater variation day by day. Augusta, perhaps the principal center of the cotton manufacture of the South, yields a little different result: the mean temperature of New London through the year is 49°; at Augusta, Ga., 64·4°, a difference of a little over 15° in heat. The mean relative humidity at New London is 74·53 per cent; the greatest variation in the year, 23·4 per cent; the mean variation, 10 per cent. At Augusta, Ga., however, the mean relative humidity is 71·42; the extreme variation 55 per cent, and the mean variation 37·45 per cent in relative humidity, or nearly four times as much as at New London.