329 



XXT. 



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 



