IN THE ARCTIC SEAS. 



23 



Clironomctcr comp.arisons : — 



Pocket chronometer 4'' SS"" l'7^2 

 34 48.4 



36 01.4 



37 17.9 



No. 2143 5'' 01'" 



" 370 4 5S 

 " 2721 20 



" 2fi4 40 



The sky was very clear. Thermometer at immersion — 53° (corrected temp. = — 58°. 2), at the emer- 

 sion — 52° (corrected temp. = — 54°. 6). 



Occultation of Mars. February 13, 1854. 



Immersion, first contact at l^^ 04™ 59^0 Pocket chronometer. A. Sonntag, observer. 

 " second " at 1 06 01.5 



(Disappearance.) 

 " " " at 1 33 47.0 No. 2143. Dr. Kane, observer. 



(Disappearance.) 

 Emersion, last contact at 1 36 05.5 Pocket chronometer. A. Sonntag, observer. 



Chronometer comparisons : — 



Pocket chronometer 1'' 14™ 01^2 No. 2143 1^42™ 



15 51.2 " 370 40 



16 20.8 " 2721 9 



17 18.0 " 264 20 



]Sfote. — Moon near the horizon, limb much undulating. Immersion reliable, emersion doubtful ; per- 

 haps too late. The planet reappeared at a different place than expected. 



The observations for time, for the above occultations, were made with the eighteen inch transit 

 instrument. 



Observation of the solar eclipse. May 15, 1855. 



The original entry of the observations of this eclipse I could not find: the follow- 

 ing has been copied from the published account in the Narrative : — 



Mean local time of beginning 9'' 13™ 41^ Dr. Kane, observer. 



38 A. Sonntag, " 



" " " ending 10 55 44 Dr. Kane, " 



52 A. Sonntag, " 



Altitude of the sun at beginning 10° 17', at ending 8°. The time was obtained 

 from observations of equal altitudes of the sim. 



Reduction of the preceding Observations for Longitude. 



Converting the chronometer error on sidereal time to its equivalent on mean 

 time, we have, from the preceding transit reductions, the following results : — 



1853. 



December 8 

 9 

 12 

 13 

 14 

 15 



7'' 13" 



7 54 



10 

 9 



11 

 9 



02 

 17 

 38 

 56 



i; = _4i' 42" 



—4 

 —4 

 —4 

 —4 

 —4 



42 

 42 

 42 

 42 



42 



24'. 8 



17.9 



23.9 



48.9 



16.6 



00.5 



22s. 2 



Mean, December 13.5 E = —i 42 22.1 ± 5^ 



The differences in the values of E are due to the imperfect transits arising from 



the difficulty of obtaining a reliable azimutlial determination, and since the rate of 



the chronometer has been found by frequent comparisons with the other mean 



time chronometers to be uniform, I have preferred to use the mean E from the 



