310 cook's VOYAGE TO APRIL, 



From the results of the last fifteen days' observ- 

 ations of equal altitudes of the sun, the daily rate 

 of the time-keeper was loosing, on mean time, 7" \ 

 and the 16th of April, she was too slow for mean time, 

 by I6 h m 58", 45. There was found an irregularity 

 in her rate, greater than at any time before. It was 

 thought proper to reject the first five days, as the rate 

 in them differed so much from that of the fifteen fol- 

 lowing ; and even in these, each day differed from 

 another more than usual. 



Variation of the Compass. 



April fA,M.7 Observatory, f 15 57' 48*" 7 , - 4q , 25 f east 



4th "[P.M. J Mean of 4 needles 115 41 2 j lb * y zt> eaSt * 



5th. J A.M.I Onboard the ship, ("19 50 49 1 Jq 44 , 7i 

 17th. | P.M. /Mean of 4 needles 119 38 46 S ** 0i * 



The variation found on board the ship ought to be 

 taken for the true one, not only as it agreed with 

 what we observed at sea ; but because it was found 

 that there was something ashore that had a consider- 

 able effect upon the compasses ; in some places more 

 than others. At one spot, on the west point of the 

 sound, the needle was attracted llf points from its 

 proper direction. 



Inclination of the dipping Needle. 



April 



5th. On board with / Marked ~) End North /71 26' 22"1 70 , r , 

 balanced needle \ Unmarked J and dipping \71 54 22^ J a 



The same needle / Marked \ End North J 72 3 45 

 at the observatory \ Unmarked J and dipping \71 56 15 



18th Ditto f Marked \ End North /71 58 20 



\ Unmarked ) and dipping \ 72 16 10 



5th. Spare needle at f Marked " End North T72 32 30 

 the observatory (__ Unmarked J and dipping \ 73 6 



lath -n'tf /Marked 1 End North / 72 55 O 



ltftn. unto - - \ Unmarked/ and dipping \ 73 28 30 



22d. Spare needle on /Marked \ End North (73 28 38 

 board - - \ Unmarked J and dipping ( 72 53 SO 



Hence the mean dip, with both needles, on shore, was - 

 On board 



