Maaned}?, 
hvilke Driften gik i Retninger, der vare betydelig afvigende 
i en De Maaneder, October og November, i 
fra Vindens Middelretning, ere ikke medtagne. I de øvrige 
Maaneder gaar, som man ser, Driften meget nær i samme 
Retning som den herskende Vind. 
Vind 
12 
pass towards which it moves, and the rate of the drift in nau- 
_ tical miles for one month.* The months October and Novem- 
ber, during which the drift took directions deviating very 
considerably from the mean direction of the wind, have not 
been included, In the other months, the drift had, as will be 
seen, very nearly the same direction as the prevailing wind. 
‘Drift Vind 
Maaned Dage Retning Styrke —Retning Hast. Hast. Drift f 
(Month) — (Days) (Wind (Drift (Wind 1 24h. ; 
Direction Force) Direction Rate) Velocity) 
September 30 INE 82H): 2.8 S. 40° W. 37’ 7.8 1479 0. 16 
December 31 Nv 61° W. 32 8. 47° EF. 68 | 2 SG 2. 19 0. 26 
Januar 31 N. 44° W. as Bag, rng | ee 3. 65 0. 31 
Februar 28 N. 26° W. ÅT So  §? TB, 166 12.6 5. 93 0. 47 
Marts 31 N. 19° W. 4.0 S. 16° E. 94 10.2 2, OB 0, 30 
April 2 INEST) We 5.3 Ss. 168 13.2 7. 30 0. 56 
I den anden Del af Tabellen er Vindhastigheden den 
efter Scotts Tabel til Meter p. S. omsatte Styrke, Driften 
beregnet 1 Kvartmil i 24 Timer og jf Forholdet mellem 
Isens Hastighed i Kvartmil i 24 Timer og en Vindhastighed 
af I Meter per Secund. Tages Middel af disse Tal (Summen 
af Drift: Summen af Vindhastighed) faar man som Resultat, 
at en (observeret) Vindhastighed af 1 m. p. S. skulde frem- 
bringe en Hastighed af Isen (og dermed af Vandets Overflade) 
af 0.36 Kvartmil i 24 Timer (0.008 m. p. 8.) For det aabne 
Hav fandtes ovenfor Factoren 1.5 Kvartmil. Den samme 
Vindhastighed driver altsaa den aabne Havflade 4.2 Gange 
hurtigere frem end den isbelagte Overflade. 
Isen 1 Baffinsbugt var hindret 1 sin Bevægelse der- 
ved, at den paa begge Sider stødte til Land. I Grønlands- 
havet og 1 Østhavet er dette Tilfældet kun paa den Side, 
der støder til Grønlands Østkyst eller til Østspidsbergen 
og Franz-Joseph-Land, medens Havoverfladen ved Isgrænd- 
sen kan antage den hele, det aabne Hav tilkommende, Ha- 
stighed. Jeg regner derfor, at Stromfactoren f voxer fra 
Kysten (0.008) udover mod Isgrændsen saaledes, at Til- 
væxten er jevn, og at den ved Isgrændsen selv gaar op til 
den, som gjælder for det aabne Hav (0.0322). 
I Østhavet er paa samme Maade regnet, mellem Øst- 
spidsbergen og Novaja Semlja, med Factorer fra 0.008 
(77°.5 N. 40° E.) til 0.0822 ved Isgrændsen. 
Ved Hjelp af de anførte Factorer beregnedes de til 
forskellige Vindhastigheder svarende Strømhastigheder. Disse 
afsattes paa et Kart (Pl. XXXII). Dette viser saaledes 
de normale Vindes directe, locale Virkning paa Havover- 
fladen. 
Bevægelse ikke følge pah alle Steder. Langt ude paa 
Havet, fjernt fra Kysterne, er saadant tildels muligt, men 
Men disse directe Indvirkninger kan Havfladens 
nærmere Kysterne maa Havets Bevægelse rette sig efter 
2 Weyprecht. 
Die Metamorphosen des Polareises. S. 225. 
In the second part of the Table, the velocity of the 
wind is the force converted by Scott’s Table into metres 
per second; the rate of the drift that computed in nau- 
tical miles per 24 hours; and f the ratio of the motion 
of the ice in nautical miles per 24 hours to a wind-velocity 
of 1 metre per second. Now, if we take the mean of these 
figures (sum of drift divided by sum of wind-velocity), the 
result will be that a wind-velocity of 1 metre per second (as 
observed) should produce a rate of motion in the ice — 
and thereby in the surface of the water — reaching 0.36 
nautical mile in 24 hours (0.008 m. per sec.). For the open 
sea, I found, as stated above, the factor 1.5 nautical mile. 
Hence, the same velocity of wind impels the open surface 
of the sea at a rate 4.2 times greater than it does an ice- 
encumbered surface. 
The ice in Baffin’s Bay is obstructed in its motion 
by coming on both sides in contact with land. In the 
Greenland Sea and the Barents Sea this occurs on one 
side only, viz., that adjoining the east coast of Greenland 
or Hast Spitzbergen and Franz-Josephs-Land, whereas at 
the ice-limit, the sea-surface can assume the full rate of 
the open sea. Hence I take the current-factor, f, as increas- 
ing from the coast (0.008) towards the ice-limit, in such 
manner that the increase is uniform, and reaches at the 
ice-limit that found for the open sea (0.0322). 
For the Barents Sea, between East Spitzbergen and 
Novaja Semlja, I-have in like manner computed with factors 
from 0.008 (lat. 77°.5 N, long. 40° E) to 0.0322 at the ice-limit. 
By means of the given factors, I calculated the veloci- 
ties of currents corresponding to the different velocities of 
wind. The said velocities were marked off on a map, 
Pl. XXXII. This shows accordingly the direct, local effect 
of normal winds on the surface of the sea. But such direct 
impulse the motion of the sea-surface cannot follow in all 
places. Far out, at a great distance from the coasts, this 
may indeed to some extent be possible, but nearer the 
1 Weyprecht. Die Metamorphosen des Polareises, p. 225. 
