METEOROLOGICAL OBSERVATIONS. 



in 



A number of simultaneous readings of thermometers Nos. 3, 1, 9, A, 1663, 

 also of a few others, were taken daily between November 12, 1860, and July 12, 

 1861, at the hours 8 A. M., 2 and 10 P. M. Of these readings such use will be 

 made as circumstances seem to require. There are occasionally omissions in this 

 record. Between November 26, 1860, and March 4, 1861, hourly readings of the 

 same thermometers were taken on fifteen days (at intervals of one week). 



Comparison of thermometers No. 3 and No. 13. 



These thermometers were read together frequently between April 7, 1861, and 

 July 6, 1861; the following corrections to No. 13 were deduced from these 

 comparisons: — 



Temperature by No. 13. 



Correction. 



Nuraber of observations 



22° 



+ 1°.4 



1 



—10 



—0.9 



It 



+ 1 



—0.2 



25 



+n 



+ 1.6 



25 



+ 25 



+ 1.8 



54 



-1-35 



+ 1.2 



74 



+ 45 



—1.2 



2t 



+53 



—1.9 



8 



These comparisons being made in the air, are yet sufficiently numerous to give 

 a reliable correction. 



Most of the meteorological instruments were kept in a large box on shore near 

 the astronomical and magnetic observatory, in the rear of the harbor. 



The record of the temperature of the air comprises daily bi-hourly observations 

 (with occasional omissions) between September 1, 1860, and July 31, 1861. Ther- 

 mometer No. 7 was used between September 1 and November 7, on which date 

 No. 6 was hung up. No. 7 having been carried away. November 12th, thermome- 

 ter No. 6 was taken to the meteorological box on shore, and No. 4 substituted, 

 hung on a pole erected on the floe ice near the schooner. On April 5th, No. 13 

 was substituted for No. 4. On March 16th, the thermometers were changed in 

 position at the box on shore, and on May 23d they were returned on board. 



