erendset af Isobaren for 755.6 mm. Indenfor denne findes 
to partielle Minima, et østenfor Island, hvor Lufttrykket 
gaar ned til lidt under 755.3 mm, og et vestenfor Nord- 
kap, hvor det laveste Lufttryk netop naar denne Værdi. 
Mellem disse Minima stiger Lufttrykket ikke højere end til 
henimod 755.6 mm, paa 6795 N. Br. og 00 Lede. Den 
østlige Del af Island danner en barometrisk Højderyg paa 
755.7 mm mellem det grønlandsk-islandske og det norske 
Hays Minima. Imellem Nordgrønland og Nordspidsbergen 
gaar Lufttrykket op til over 761 mm. Det samme Lutt- 
tryk findes i det sydøstre Hjørne af Kartet i Øst-Preussen 
og Rusland. I den centrale Del af den skandinaviske Halvø 
er der et secundært Maximum paa 759.5 mm. 
2. Vinden. 
For at finde den midlere eller resulterende Retning 
og Hastighed af Vinden paa vort Nordhav har jeg benyt- 
tet følgende Formler, der udtrykke den bariske Vindlov!. 
Er: 
G den barometriske Gradient, udtrykt i Millimeter ab- 
solut (reduceret til Normaltyngden) Kviksolvhojde ved 
0°, per midlere Meridiangrad eller 111 Kilometer 
(20000000 m:90 = 111.111 Kilometer), 
90 
10 000 000 
Factor, der reducerer Gradienten til Trykforskjel i 
Kilogram (Normaltyngde) per IK vadratmeter (13.59593 
er Kviksølvets specifiske Vægt ved 0°), 
vn = lasso 
= 0.00012236 [log u = 6.08765], en 
o Massen af en Kubikmeter Luft eller det af Tyngden 
foraarsagede Tryk af en Kubikmeter Luft paa et 
horizontalt Underlag, divideret med Tyngdens Acce- 
leration, 
a Vindens Afbøjningsvinkel, regnet fra Gradientens Ret- 
ning, 
w Jordens Omdrejningshastighed = 2 77 : 86164.09 = 
0.00007292 [log 2 = 6.16338}, 
v Vindens Hastighed i Meter per Secund, 
k Krictionscoefficienten, 
g den geografiske Bredde, 
har man følgende Formler: 
G sin aa = 2 w v sin | 
Gi cos å = Å VU 
2 w sin —p 
k 
tang å = 
' Etudes sur les mouvements de l’atmosphére par OC. M. Guld- 
berg et H. Mohn, S.20. Zeitschrift der østerreichisehen Gesellschaft 
fir Meteorologie, 1877, S. 52. 
S. 120. 
Sprung, Lehrbuch der Meteorologie, 
an elongated minimum, bounded by the isobar for 755.6 mm. 
Within this isobar, occur two partial minima, one east 
of Iceland, where the atmospheric pressure goes down to 
a little under 755.3 mm., and one west of the North Cape, 
where the lowest atmospheric pressure just reaches that 
value. Betwixt these minima, the pressure does not rise 
higher than about 755.6 mm. in lat. 67°.5 N and long. 0°. 
The eastern tract of Iceland constitutes a barometrical ridge, 
with a pressure of 755.7 mm., extending between the Green- 
land-Icelandic and the Norwegian-Sea minima. Again, 
between North Greenland and North Spitzbergen, the 
pressure reaches upwards of 761 mm. An equal atmo- 
spheric pressure occurs in the south-eastern corner of 
the map, viz., in East Prussia and Russia. Over the central 
region of the Scandinavian peninsula, occurs a secondary 
maximum, with a pressure of 759.5 mm. 
2. The Wind. 
In order to find the mean or resulting direction 
and velocity of the wind throughout the North Ocean, I 
have made use of the following formule, that express the 
Let 
G be the barometrical gradient, expressed in millimetres 
and absolute (with reduction to normal gravity) height 
barie wind-law. ! 
of mereury at 0°, per one mean degree of meridian, 
or 111 kilometres (10 000 000 m.: 90 = 111.111 kilo- 
metres) ; 
; 90 
= 13.5959: soe 
oes [8.59593 10 000 000 
tactor which reduces the gradient to difference of 
= 0.00012236 [log «= 6.08765], a 
pressure in kilogrammes (normal gravity) on a square 
metre (13.59593 = the specific gravity of mercury 
at 0°): 
0 the mass of a cubic metre of air, or the pressure caused 
by the weight of a cubic metre of air on a horizontal 
base divided by the acceleration of gravity; 
a the wind’s angle of deviation, computed from the direction 
of the gradient; 
w the earth’s velocity of rotation = 2 w : 86164.09 = 
0.00007292 [log 20 = 6.16385}; 
v the velocity of the wind, in metres per second; 
k the friction-coefficient ; 
g the latitude; 
and we have the following formule: — 
ua . 5 
—Gsna=20 Vv sin | 
Q 
u“ 
“Gecsa=kyv 
oO 
2 wsin | 
min = aE 
k 
1 tudes sur les mouvements de l’atmosphére par C. M. Guld- 
berg et H. Mohn, p. 20. Zeitschrift der dsterreichischen Gesellschaft 
fiir Meteorologie, 1877, p. 52. 
p. 120. 
Sprung, Lehrbuch der Meteorologie, 
