Survey of Northeast Greenland. 193 
place is 5 å 6m above the sea. Below this height there must be a 
RER ; dT PERL 
stratum of air with a great negative value of „. The upward mirage 
also shows great leaps of temperature in the higher strata 
which tallies with the levellings at IX and X. 
( “= positive) 
| 
| 
| | | 
| 
| 
— = ЕЕ 
EEE —— Ys = —= 
LL 
<A == ZZ 
7, 
GGG TE TE ZZ ZO Zee 7 a 
Fig. 17. Telescopic image during the levelling at Cairn V, Oct. 21st 1907 at 1P30. 
In the background upward mirage of Store Koldewey. The three horizontal lines 
are the horizontal threads of the telescope. Interval between middle thread 
and outer threads about 2’. 
N 
Under the above-mentioned, very striking conditions of refraction 
there was reason to expect interesting results of a kite-ascension; 
but on account of the calm weather no such ascension could be 
undertaken. 
At noon the wind blew strongly from WNW, and the kite was 
rise y == 
D Z > = 
ZL. ZA LZ TD 
Fig. 18. Telescopic image during the levellings at Cairn V. 
Normal conditions of refraction. 
N 
sent up simultaneously with renewed levellings. The journal of these 
levellings shows the following result: 
21/X 1907 afternoon. Observer: Kocu; assistant: Еви$ 
Commenced 1P15, 
finished 1P50. 
Cover of clouds: 2°—3°, a-str., Föhn clouds. 
Wind: WNW, 8 à 10m. 
b, = 763.0 (+ 12.2); t, = — 15.0; moisture 79 lo. 
b, = 762.7 (+ 10.7); {, = — 16.0; moisture 77 io. 
Glimmer 1—2 everywhere. 
Mirage 0; on Store Koldewey upward mirage (Fig. 17). 
Vertical movement 2—3 at X, otherwise 0. 
Az. 
RAIN... — 10.4 (value strikingly low). 
Зо). Ære + 6”.3 (value strikingly low). 
ME WOMAN ES SEE + 7.0 (value low according to the season). 
The “Skerry” (16m) + 36”.4 (value normal according to the season). 
at 2P00 Horizon II. + 137” (value strikingly high). 
13= 
