Part 1728 of 4150 from book5
The equilibriumbook40 of the balloon had been calculated at the level of the sea and as the country was continually ascending and had reached an elevationbook71 of from six to seven hundred feet the balloon would have had a tendency to go lower than the surface of the soil itself. The balloon had been bearing about thirty miles to the northwest during the last two hours. The wind fell with the close of the day and the atmosphere seemed to sleep. There were twentyseven degrees of difference between its temperature and that of the daytime.... more