BAROMETRICAL AND METEOROLOGICAL OBSERVATIONS. 



l.T.MVI ION OF INK nlisF.m Ml" 



The first step, in pre] 

 reduction of the observed re 

 had the temperature of the 

 pose I made use of the tab! 

 soman Institution. 



Next, the correction foi 



Fort Kearney by nn 



appeared desirable. 

 keep the others perfc 

 It will be suffici 

 without giving- all tin 



sta 



check in Part C, Tab 

 Tables, which gives 

 with the internal di 

 reduced to English i 

 the following exampl 

 tube of barometer N< 



the attention of o 

 that, in determini, 

 )le XXVII, of the 



■initio 



ission of the mercurial column due to capillar}' action, 

 :' the tube, and the height of the meniscus as arguments, 

 rom a table of Delcros. The use of it may be seen from 

 Limarv, 1859, at Camp Floyd, I had to replace the original 

 rhich had been broken, by a new one. The inner diam- 

 ch, while that of the former had been 0.20 inch. Hav- 

 ing performed the operation with all possible care, I waited some days, in order to give 

 the instrument time to obtain its normal conditions. I then compared it with the other, 

 and found its zero-error equal to 0.042 inch. The meniscus of Xo. 1062 was now 

 0.024 inch high, which corresponds, according to the table, to a depression of 0.064 

 inch. To correct for the capillar} attraction of the old and wider tube, the maker 



