166 



REPORT- — 1865. 



§ 4. Adopted Temperatures of the Air, the Wet-bulb, and tile Dew- 

 point in Three Balloon Ascents. 



From all the observations of the temperature of the air, evaporation, and dew-point 

 in Table I., a determination was made of these elements, with the corresponding reading or 

 mean of readings of the barometer and heights, and then the next Table was formed. 



Table II. a.— Showing the adopted Reading of the Barometer, calculated 

 Height above the Sea, Temperature of the Air, Temperature of the Wet- 

 bulb Thermometer, and Temperature of the Dew-point, in the 



Twenty-third Ascent. — December 1, 186-i. 



