XXI. 



LD FRENCH BAROMETER 



TABLE 



FOB 



REDUCING TO THE FREEZING POINT THE OBSERVATIONS 

 TAKEN WITH OLD FRENCH BAROMETERS, 



provided with brass scales, extending from the cistern to the 



top of the mercurial column ; calculated from 240 to 34-5 



lines, or from 23 inches 4 lines to 28 inches 9 lines. 



By Kaemtz. 



123 



