APPENDIX. 



163 



True Bearing of the 

 Celestial Body. 



Amount of Mag- 

 netic Error. 



REMARKS. 







o ^ 



PQ 



3 Points w 

 >8 w. 



Nortli 



3w. 



In the forenoon watch our larboard ^, 

 which had agreed with the two others in 

 shewing- mag-netic error as noted in tlie co- 

 lumn, suddenly pointed e.n.e. and no tap- 

 ping- or motion would keep it to any other 

 point for two or three minutes, after which 

 it as suddenly recovered its agreement with 

 the others, and continued quite correct. 

 We nowjfrom repeated observations, ascer- 

 tained that, with the head between n.w. 

 and west, the raag-netic error amounted to 

 8 pts. w., while, with the head due south, 

 the compasses would not remain quiet, or 

 assumed at times each a direction of its 

 own, yet if shaken from this they never re- 

 turned to the same position. Heaving- to, 

 on this night, I observed that, on changing 

 the ship's head from n. (^), or N.w.b.N. 

 (true), and rounding to port, all the 

 compasses changed inversely to star- 

 board, as N.b.E., NE., to E.b.N., at which 

 latter point the ship's head remained all 

 night, although the wind, by an observa- 

 tion of the Pole *, Avas unchanged from 

 s.w. ; thus shewing, as her head was in 

 factw.N.w., a magnetic error increasing 

 gradually as she came round from N. <^ (/.) 



At four A.M. on the 31st I kept away 

 to starboard, and the compasses remained 

 quite steady until we had fallen off about 

 four points, when all flew round at the 

 same moment ; and when by the Pole -Jf 

 our head was N.w.b.N., all again pointed 

 north, most= correctly, as they had done 

 before {g). 



" '^2 M 



