42 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 90 



UNITED STATES 



Authority. 



United States Weather Bureau, Washington, D. C. Continuation 



of stations published in volume 79, Smithsonian Misc. Coll. 

 The pressure at each station where removals have occurred is 



corrected to the level indicated in the tables by the height of 



the barometer (H b ). 

 Hours of Observation. 



Observations throughout the United States are taken at 8 1 ' and 



20 h , 75th meridian time. 

 Methods of Observation and Reduction. 



Details concerning the instruments and the methods of observing 



and recording the data are given in volume 79, Smithsonian 



Misc. Coll., p. 69. 

 Changes in Elevation. 



There are listed below the changes in elevation of barometer at 



Weather Rureau stations whose records are published in 



World Weather Records. These changes relate to the period 



following that of the published record and ending with the 



year 1930. 

 Eagle, Alaska. The elevation should have been published as 



815 ft. 

 Tanana, Alaska. Changed from 220 ft. to 228 ft., beginning with 



June 1924. 

 Burlington, Vt. Changed from 404 ft. to 403 ft., beginning with 



November 1925. 

 Denver, Colo. The elevation should have been published as 



5292 ft. 

 El Paso, Texas. Changed from 3762 ft. to 3778 ft., beginning 



with June 1925. 

 Helena, Mont. Changed from 41 10 ft. to 4124 ft., beginning 



with March 1930. 

 Modena, Utah. Changed from 5479 ft. to 5473 ft., beginning 



with June 1926. 

 Philadelphia, Pa. The elevation should have been published as 



114 ft. 

 Red Bluff, Calif. Changed from 332 ft. to 330 ft., beginning 



with June 1928. 

 In new surveys slight changes are sometimes made in the 



elevation of the barometer ; in most cases this is due to 



reference to a new datum. Jn the cases in question no cor- 



