XX. 



METRICAL BAROMETER. 



TABLE 



FOR 



REDUCING TO THE FREEZING POINT THE BAROMETRICAL 



COLUMN, 



measured by brass scales, extending from the cistern to the top ; cal- 

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



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



By M. T. Haeghens. 



79 



