130 



GEELMUYDEN. ASTRONOMICAL OBSERVATIONS. [NOUW. I-OL. KXI-. 



On the way southwards from the Winter Hut. 



Comparisons between the watches I and II. 



The running down of I took place the day after a struggle with a walrus which had 

 attacked and damaged one of the kayaks. On applying the mean relative acceleration of 14 S ,6. 

 the reduction to the former state will be: 



June 13, 2'' 40 am I-II = + 21' 3 16* 



Rel. Ace. in 4.1 days +10 



June 17, I-II should have been + 2 4 16 

 " was - 2 19 50 



I lost through stopping 4 24 6 



It will be seen that the relative acceleration during the travelling was in the mean 

 7 seconds less than during the last month at the Winter Hut. As to the acceleration of I, which 

 was found to be + 9.2 during the same month, it may be mentioned that a series of comparisons 

 with Mr. Jackson's chronometer in June and July gave an acceleration of 10 s relative to this 

 chronometer, which was said to lose O s .5 daily, consequently I accelerating 9 S .5 daily. Some 

 observations on Hie way southwards which will be found below seem, however, to indicate that 

 the acceleration during the travelling was in the mean somewhat greater, about 12 S .5. This 

 value has been used for computing the longitude West of the meridian of the Winter Hut, 

 designated below by I. 



In order to utilise the bearings by compass it was necessary to know the magnetic 

 declination. For the Winter Hut the value 18.2 E, found on May 16, was adopted. In Jackson's 

 A Thotisand Days in the Arctic is given a table of magnetic declinations at Cape Flora as 

 determined by Mr. Armitage. The mean value for the summer 18% was 15.l E. The isogones 

 in this regions running nearly north and south, this would correspond nearly to 0.6 decreasing 

 of magnetic declination per degree of west longitude. 



In some cases the position at the time of observation has been determined by the crossing 

 of such a line of bearing with the line of equal altitudes. 



