I^SH 



;rwJVv^A^x>»^ 



UNITED STATES DEPARTMENT OF COMMERCE 

 WEATHER BUREAU - - - F. W. Reichelderfer, Chief 



BAROMETERS 



AND THE MEASUREMENT OF 



ATMOSPHERIC PRESSURE 



CntccLAR F, Instrument Division - Seventh Edition : Revised 1941 





iiiLUtion 



6 



mi 



