ASTRONOMICAL OBSERVATIONS 



May 17, 1854. Observatious of circum-meridian altitudes of tlie sun, for latitude. 

 Gambey sextant ; on the floe near the brig. 



Double altitude. 



61° 5(!' 0' 



56 30 



56 25 



60 53 30 



54 00 



53 40 



Pocket chronometer. 



o 



o 



Double altitude. 



Index error —7' 40". < = + 10°.5 F. & = 29.95 in. r = + 53°. 



O's corrected altitude (for inde.x, refraction, and parallax) 30° 44' 31" 30° 44' 31" 



Chronometer time of observation .... 4'' 32™ 31". 2 4'' 38™ 57'. 8 



Chronometer error — 4 39 24.4 — 4 39 24.4 



Mean time of observation 

 Hour angle 

 Reduction to meridian 

 O's declination . 

 Resulting latitude 



Mean 



78 37 12 



May 19, 1854. Observations of equal altitudes of the sun, for time. 

 Gambey sextant ; on the floe near the brig. 



Pocket chronometer. 

 A.M. 



Qh 33m 29» 



34 37 



35 28 



Double altitude. 



Q 50° 30' 

 35 

 40 



Pocket chronometer. Pocket chronometer.' Doiihle altitude 

 P. M. 



9».5 

 4 

 16.5 



Oh 3710 09' 



37 57 



38 54 



© 49° 45' 

 50 

 55 



Pocket chronometer. 

 P. M. 



8" 35" 

 34 



33 



34" 



41 



43.5 



A.M. Index error — 8' 44". P.M. Index error — 9' 22". 



/= + 13°.5F. 6 = 30.05 in. 2 = + 52°. <= + 19°.3F. 6 = 30.20 in. * = + 53°. 



Observation not very exact, the mercury being in motion. 



A.M. Chronometer time 0'' 36™ 15^6 

 Equation of equal altitudes 

 Middle chronometer time . 



Chronometer time of apparent noon 

 Equation of time 



Chronometer time of mean noon 



P.M. Chronometer time 8'> 36™ 24^7 

 — 46^7 

 4'' 36™ 20.1 



4 35 33.4 

 + 3 48.4 



4 39 21.8 



Recapitulation of Chronometer Errors Determined in ]May, 1854. 

 M.ay 16. Pocket chronometer fast of Fern Rock mean time . . . 4'' 39™ 24«.9 



4 39 24.4 

 4 39 21.8 



Approximate rate 1^ losing per day. 



