329 



XXI. 



OLD FRENCH BAROMETER- 



TABLE 



FOR 



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 345 



LINES, OR FROM 23 INCHES 4 LINES TO 28 INCHES 9 LINES. 



BY KAEMTZ. 



123 



