II A. Hazen — Air-pressure at High Statio 



ve apply the 



the diurnal range of pressur 

 nountains, we shall fi 



the maxima and 

 and 



find that it affords a satisfactory 

 xplanation of the retardation at the summits. For the 

 purpose of comparison I have taken the hourly observations at 

 Mount Washington and base in May. lS72"and 73, and in 

 June, 1873; also, a manuscript copy of hourly observations 

 made by the observers of the United" States Signal Service at 

 Pike's Peak and Colorado Springs during August and Sep- 

 tember, 1874. The means for each hour have been embodied 

 in Table III. The difference in level between the base and 









Washington an 



dPites 



/V«A\ 











May, 1872. 























day. 



Mt.W. 



Base. 



Air col. 



Mt.W. 



Ba-e. 



Vir col 



Pik-V I" 



C.Sp*. 



Air,-!. 



3 









"1 



~ r \% 



i" 









4 









■746 



■16C 



::-'" 









6 



23'*676* 



27"m«9S! 



36°-2 



■7f!»; 



■it;' 



:i.s-(5 



17'-!»S2 



24' 201 



47°1 









:;ti 



•762 







17-!>«s 



•202 













•767 





42-2 



IT -..:.: 



•204 550 























•098 









is-o(i;t 



























42'6 

















13-3 













•687 





43-6 













•689 







•777 -152 





















17-!t:U 



•142 61-2 





•683 







•771 1 50 



47-6 



L?-992 























•691 













•152 58-2 



























isnm 



•ISO :.::.-> 



10 



•680 



•102 



!? ;m 



4 1 -0 



18-003 



•188; 52-3 



Mid*. 



•676 



095 



n-4 •?« ill 



;S-s 







