IN THE ARCTIC SEAS. 7 



unusual amount of refraction in the morning, or else the rate of the chronometer 

 has changed in the interval. 



Afternoon altitudes of the sun. 1st set. 



O's corrected altitude (for index, refraction, and parallax) 25° 05' 11" 

 O's declination . . . . . . . . 19 10 18 



And the hour angle 



Equation of time .... 



Mean time of observation 

 Chronometer time of observation . 



Chronometer error on Fern Rock mean time 



Mean 



3" 47"" 12'. 5 

 3 53.4 



3 43 19.1 

 8 22 45.5 



2d set. 

 25° 22' 44" 

 19 10 26 

 31. 40m 24«.9 

 3 53.4 



3 36 31.5 

 8 15 55.0 



4 39 26.4 _ 4 39 23.5 



— 4 39 24.9 



May 17, 1854. Observations of equal altitudes of the suu, for time. 

 Gambey sextant ; on the floe near the brig. 



Pocket chronotneter 

 A. M. 



Oil 26-" 45^ 



17 37 



18 36 



20 23 



21 13 



22 15 



Double altitude. 



Pocket chronometer. 

 P.M. 



O 48° 10' 

 15 

 20 



O 47 25 

 30 

 35 



55"» 39^.5 

 54 36 

 53 48.5 



52 18 

 51 23 

 50 24.5 



Pocket chronometer. 

 A. M. 



Oh 23"' 32" 



24 20 



25 22 



26 48 



27 44 



28 34 



Double altitude. 



Pocket chronometer, 

 P.M. 



O 48° 45' 

 50 

 55 



O 48 



5 



10 



gh 49m 148 2 

 48 22.5 

 47 21.5 



8 46 26 

 45 35 

 44 41 



For A. M. observations, index error — 7' 46". I = + 9°.3 F. b = 30.00 in. t = -\- 53°. 

 For P. M. observations, index error — 7' 28". t = + 14°.l F. h = 29.95 in. t = + 56°. 



A.M. Chronometer time 0'' 19°^ 28M 

 A. M. Chronometer time 26 03.4 

 Equation of equal altitudes 

 Middle chronometer time . 



Chronometer time of apparent noon. 

 Equation of time 



Chronometer time of mean noon 



Chronometer error on Fern Rock mean time 



P.M. Chronometer time 9,^ 53™ 01^5 set 1. 

 P. M. Chronometer time 8 46 56.7 set 2. 

 — 50^8(setl.) — 50^2(set2.) 



4I' 36°' 14.8 4I' 36"" 30.0 



4 35 24.0 

 + 3 52.5 



4 39 16.5 



4 35 39.8 

 + 3 52.5 



4 39 32.3 



— 4 39 24.4 



