285 



XX 



METRICAL BAROMETER, 



TABLE 



FOR 



REDUCING TO THE FREEZINCi POINT THE BAROMETRICAL 



COLUMN, 



rvsured by brass scales, extending from the cistern to the top; caiv 

 culated for the heights between 605 and 800 millimetres, and fob 



every tenth of a degree, from 0° to -f" and 35° centigrade. 



By M. T. Haeghens. 



79 



