172 I. P. Косн. 
value of k corresponding to the sight at Cairn X, that is k — kr 
+ 0.199 — 0.359 (see table p. 156); but this value we get during the obser- 
vation at 8250, whereas the observation at 1P30, for which x is computed, 
makes k — ie + 0.086 — 0.246. The vertical movement for Cairn X 
was at 8250 as well as at 1730 estimated at 3,-and was, as mentioned 
on p. 169, at 1P30 measured at 15”.5, to which corresponds dk — 0.128. 
It is only reasonable, that under conditions of this kind and espe- 
cially in reference to the sharp breaks in the direction and velocity 
of the wind (as to this see later) one can orly get quite abnormal 
differences between k and x, and this seems to have occurred on 
October 21st. As there,are now only nine simultaneous values of k 
and x at Cairn X, an abnormal case will have quite a disturbing 
effect on the means. 
21. October. 1 Drachen (4 m°), 1900 m Draht. 
Zeit | Seehöhe | Luftdruck Temperatur | Rel. Feuch- Wind 
m | mm (Oe tigkeit °/o т. р. $. 
1200 5 | 7639 + 15.0 77 | WNWS 
tae 200 | “Tab a 19.6 76 aang 
125 | 500 || 76 = ee 62 WSW 12 
1738 9330 |) ers ET | 49 WSW 9 
jag’! 5500 |) DEE = 14 |: TROIS 
155 | 200 Fe 1) IR On Wie 
215 | 5.) |) ee +151 77 WNW 11 
1) Wegen zu schneller Anderung unbrauchbar. 
„Bewölkerung 3—2? a-str., zuletzt auch Föhnwolken. Starke Luftspiegelung nach 
oben an der grossen Koldewey-Insel. Höchste Temperatur im Aufstieg bei 600 m 
-- 0.8°, im Abstieg = 0,3° bei 700 m. Blätterige Temperaturschichtung, der Wind- 
schichtung entsprechend: Bis 180 m WNW 4--8 m.p.s., noch fast keine Temperatur- 
zunahme. Darüber bis 300 m W 8 m.p.s., Temperatur steigt um c. 5°. Hier weiter 
scharfer Temperatursprung um mehr als 5°, und Sprung des Windes auf WSW 12 m. р. 5. 
Ascensions of kites and balloons took place in the immediate 
neighbourhood of the coast. The values of 7 and T required for 
the computation of x may therefore be supposed to correspond very 
well to the conditions of the line of vision at Cairn IX, which is 
quite short and extends along the coast, whereas one must be more 
doubtful as to their practicability at the computation of the refraction 
conditions in the line of vision at Cairn X. 
The effect of considerable areas of water is that the co-efficient 
of refraction of the air above them has a greater value than across 
land. This condition in particular makes itself very much felt in 
Northeast Greenland, as is clearly indicated by the values Io, — 0.160 
and kr — 0.516. From the following it will appear, that as far as 
