XXI. 



OLD FRENCH BAROMETER. 



TABLE 



FOB 



aEDUCING TO THE FREEZING POINT THE OBSERVATIONS 

 TAKEN WITH OLD FRENCH BAROMETERS, 



PROVIDED WITH BRASS SCALES, EXTENDING FROM THE CISTERN TO THB 

 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 



