114 GEELMUYDEN. ASTRONOMICAL OBSERVATIONS. [NORW. POL. EXP. 
from 9 pm. For the following observations, taken about 6 in the afternoon of April 2, was 
assumed g = 86° 0’. Ind. corr. (0'?). 
: dt dt 
1895 Watch I Hor. Object Sextant || LT—I as di ay ih 
hms o 4 hm s 
April 2 | 11 54 45 Glass. | Sun L. L. | 10 14.5 || 5 55 44 
0 291 iM 9 25 || 5 54 54 
0 16 30 2 9 92 | 5.57 27 
feet 
0 24 93.5 15? Sun L.L. | 4 29 ||]6 5 2 — 0.962 
0 31 36 42 |6 5 19 — 0.967 
0 35 37 4 16.5 || 6 6 56 — 0.970 
To the second observation with the glass horizon has been applied the correction + 30' 
(the limb being divided to half degrees). These three observations were very difficult. 
Supposing that the altitudes measured from the apparent horizon require a correction Sh, 
owing to irregular terrestrial refraction, and that the assumed latitude is erroneous by the 
amount 4g, the two sets of observations give the equation 
5h 56m Ys — 0.011 Jp = 6h 5m 53s + 0.143 Sp — 0.966 Sh, or 0.966 Sh — 0.154 Sp = 9.85, 
and supposing further that the meridian altitude of the next day, taken under the same meteoro- 
logical conditions, requires the same correction, which gives 4p = — Ah, the result will be: 
1.12 Sh = 9'.85 or Jh = + 8'.8 and Jp = — 8'8, 
and LT—I = 5» 56™ 8s. Combining this with I—Gr. = 0b 52m 52s, given on p. 112, the result is 
April 2, 6 p.m., E. Long. = 6 49m 0s = 102° 15° 
and April 3, Noon, N. Lat. = 85° 55’, 
1895, April 4. Bar. 30.58 in., Therm. — 31°.3 C. 
After leaving the camp of the preceding day at 3 o’clock in the morning the following 
observations were taken on the way, about four hours after starting. Assumed Lat. 86° 5'. 
Height of eye 16 feet, Ind. corr. 0. 
2 dt dt 
Watch I Object Sextant LT-I as ip rs dh 
hemes 0: hm s 
1 30 15 | Sun LLL. 6 44 5 48 2 | +0.825 | + 1.028 
42 % 6 54 5 46 57 0.375 1.046 
48 53 6 59 5 45 4 0.401 1.055 
as) al Th a) |) & 2S 183 0.445 1.073 
912 0 72 | 5 47 37 0.533 1.114 
Compass 
2 0 42 | Sun Ct. 70°%6 
8 20 73°.0 
If the altitudes require the correction 4h, and the latitude the correction 4y, the mean of 
the five altitudes will give: 
Watch I 1h 50m, LT—I = 5h 47m 938 + 0.416 Sy + 1.063 Sh. 
A comparison of this number with those of April 2 gives a strong corroboration of the 
assumption there made. The meteorological conditions being nearly the same, the same value 
of 4h may be employed. As to gy, the value assumed above would correspond to an advance 
