IN THE ARCTIC SEAS. 



9 



The pocket chronometer was made to indicate Greenwich mean time witliin a 

 few minutes; between October 5 and October 10, 1853, it ran down; October 29, it 

 was carried about for nine hours; again, November 4, it was carried on a journey 

 for three days; on the 22d of November it ran down, and on December 21 it was 

 exposed for four hours to a temperature of —38° F. Its rate, as indicated by the 

 other chronometers, 21-13, 370, 2721, and 2(54 (all mean time clironometers), was 

 tolerably uniform, and varying between 3^6 and ()\0. 



Recapitulation of Results for Latitudes of Van Rensselaer Harbor. 

 September 12, 1853. From two sets of Z. D.'s of the sun at the Fern Rock Observatory 78° 37' 44". 

 This result will be used for the reduction of the transit observations at the 

 observatory. This observatory was some distance (as we learn from pages 108, 

 116, 167, and 168, of vol. I, of the Narrative) to the northward of the position of 

 the brig. The following results for latitude refer to the position of the Brig Ad- 

 vance in the winter quarters: — 



May 14, 1854. From two sets of altitudes . 

 " 15, " 

 " 16, " 

 " 17, " 



" 20, " 



Mean 



78 37 04 + 3" 



' The recapitulation of the approximate values for latitude of the brig, on p. 387, appendix No. VI, 

 vol. II of the Narrative, has two additional values between May 14 and 15, for which I could not find 

 any record. 



