116 GEELMUYDEN. ASTRONOMICAL OBSERVATIONS. [NORW. POL. EXP. 
The above values of LT—I have been computed with y = 86° 6'.2, which follows from the 
meridian altitude. It is apparent from the increasing values of LT—I with increasing differential 
quotients that a diminution of ¢ will give better agreement. Introducing Sh and 4 as before, 
the mean of the four observations gives 
Watch I 1h 5m am., LT—I = 6b 2m Qs + 0.281 4p + 1.024 Sh. 
For Jh there is no other choice than using the former value; — 4p at noon had perhaps 
the same value, but the latitude being a little higher in the morning before the departure, it 
has been assumed that g was 86° 0’, or Sp = — 6'2. The result is then: 
LT—I = 6h 9m 373s, 
The bearings by compass have been calculated by means of these values. 
These observations were taken shortly after the stopping of both watches. If a is the 
diminution of east longitude from April 8, 8 a.m., until April 13, 7 am., and y the change of 
watch I caused by the stopping (including its acceleration during the time it was going), the com- 
bination of the two days gives the equation 
5b 31m.9 — « — y= 6h 9mM6 or y= — 37,7 — «x. 
The course set on April 8 and followed during the days following as nearly as hindrances 
permitted, was S 22° W by compass, or, with magnetic declination 45° E, S 679 W. The dis- 
tance made during the three days of travelling included in this interval, was estimated by 
Nansen to be 9 Norwegian sea-miles, or 36 minutes of a great circle, which would give 14’ differ- 
ence of latitude, and nearly 8° difference of longitude. As the course was not, of course, recti- 
linear, a reduction is necessary, and the latitudes observed show that the reduction in this 
direction is so considerable that the drift of the ice must have had something to do with it. 
How the drift has worked in the other direction cannot be decided by this consideration; the 
assumption of a considerable reduction, viz. from 8° to about 5°, for the longitude also, has been 
made mainly because the retaining of the 8° would imply a greater acceleration of watch I for 
the rest of the summer than seems likely from other observations. The value y= — 57™ 30s — J, 
given on p. 111, would correspond to the change of longitude 
a =19m.8+ 74 or nearly 59+ 24, 
The E. Long. on April 13 should then be 91°95 — &. 
1895, April 18. Bar. 29.94 in., Therm: — 26°. 
Ind. dt dt 
Watch I | Eye Sextant core LT-I qs ae ys, ah 
hm s feet o 4 ‘ hm s 
0 13 57 92 Sun L. L. 10 17 +3 || 5 34 29 | — 0.055 | + 0.884 
OO) abl 10 29 5 36 50 | — 0.015 0.883 
0 2% 42 10 34 5 36 52 | + 0.003 0.882 
Noon 16 14 55 +4 
The morning observations were made during a journey commencing on April 17, at 7.5 p.m.. 
and ending on April 18, at 10 a.m., consequently about 4 hours before reaching the camping-place 
where the meridian altitude was taken. The latter gives the N. Lat. 85° 38’. The course being 
now S by compass, the morning altitudes were reduced with y = 85° 40'. The mean of the 
three results is 
Watch I 0b 21m am., LT—I = 5h 36m 4s — 0,022 Sp + 0,883 Dh. 
