Til at beregne Afstanden fra A af de Punkter 1 Nor- 
malerne, hvor Højden over Niveaufladen er 0.1, 0.2, 0.3 
_ Meter o. s. v. have vi, naar Højden ved Kysten er H, Af- 
standen fra A langs Normalen til Kysten X, Højden h i 
Afstanden 2: 
Efter denne Formel ere Overskjæringspunkterne mel- 
lem Normalerne og Ligehøjde-Linierne beregnede. 
Mellem de ovenfor beskrevne Normaler ligger den, 
der fører til Midten af Nordsøen. Langs denne har jeg 
tænkt mig tre Stykker af Parabelbuer. I et Punkt midt 
i Nordsøen, der hvor Ligehøjdelinien for 0.7 Meter har sit 
sydligste Punkt, er Toppunktet for en Parabel med opad 
vendende Axe, hvis Ordinat ved Texel er 0.8 Meter. Her 
bliver saaledes Hastigheden Nul i Punktet midt i Nordsøen. 
Ved Texel bliver efter Formelen 
å eller U= oe 
med h = 0.8 —07 = 0.1 m, gm = 54°.5 og x = 310 km 
Hastigheden wu = 0.05 m. p. S. 
Fra Midtpunktet i Nordsøen til A deler jeg Afstan- 
den i to Dele; hver af dem bliver 700 km. Igjennem den 
sydlige Del tænker jeg mig en Parabel med Axen nedad 
og Toppunktet i Nordso-Midtpunktet. Gjennem den nord- 
lige Del lægger jeg en med denne congruent Parabel med 
Toppunktet i Å og Axen opad. Højdeforskjellen mellem 
Yderpunkterne er 0.7 m, følgelig i begge Parabler H=0.35 m. 
og X= "00 km. Der, hvor de støde sammen, 700 km fra 
A, bliver Højden 0.35 m og Hastigheden U =.0.076 m. 
p. S. Efter disse Data beregnedes Ligehøjdeliniernes Skjæ- 
ringspunkter med Normalen og afsattes i Kartet. 
Ug 
Fra Punktet B føres en Normal til Norges Kyst ved 
Vesteraalen. Vi have X= 535 km, p= 69%6, H=0.8 m, 
og finde U = 0.215 m. p. S. 
Fra B er fort en Normal langs Havfladens Fordyb- 
ning i Østhavet til Jugor-Strædet (Novaja Semlja). Langs 
denne er tænkt en Parabelbue, med Toppunkt i B og Axen 
opad. I Østhavet følger nemlig Strømmen de herskende 
Vinde. TI Nordsgen var dette ikke Tilfældet. Vi have 
X = 2100 km, p=72°.9, H= 0.8m, og finde ved Jugor- 
stredet U = 0,054 m. p. S. Efter disse Data ere Lige- 
højdeliniernes Skjæringspunkter med Normalen beregnede. 
Fra denne samme Normal, der danner Østhavets Strøm- 
Axe, lagdes Parabelbuer tvers paa Strømlinierne til Norges 
og den murmanske Kyst. Afstanden @ maaltes paa Kartet. 
9 
To compute the distance from A of the points in the 
normal lines at which the height above the surface of level 
is 0,1, 0.2, 0.8 metre, etc., we have, when the height at 
the coast is H, the distance from A along the normal line 
to the coast X, and the height h at the distance 7: — 
According to this formula, the points of intersection 
between the normal lines and the lines of equal height 
have been computed. 
Between the fore-deseribed normal lines lies 
extending to the middle of the North Sea. Along this line 
I have laid three ares of parabolic curves. At a point in 
the middle of the North Sea where the line of equal height 
for 0.7 metre reaches its most southern point, I put the 
vertex of a parabola with upward-pointing axis, the ordinate 
of which at the Texel is 0.8 metre. Here, therefore, the 
velocity will be zero at the point in the middle of the 
North Sea. At the Texel, according to the formula 
h H 
U= por V= TY 
with h = 0.8 —0.7=0.1 m, @~= 54%, and « = 310 km., 
the velocity w = 0.05 m. per see. 
From the point mm the middle of the North Sea to 
A, I divide the distance into two parts, each measuring 
700 kilometres. Throughout the southern part I assume 
a parabola to pass, with its axis pointing downwards and 
its vertex in the mid-point of the North Sea. Through- 
out the northern part I lay down a parabola congruent with 
the former, having its vertex in A and its axis pointing 
upwards. The difference in height between the outermost 
points is 0.7 metre; hence in both parabolas H = 0.35 metre 
and X= 700 kilometres. Where they meet, viz., 700 lal- 
ometres from A, the height will be 0.35 metre and the ve- 
locity U = 0.076 metre per second. According to these 
data, the points of section for the lines of equal height 
with the normal line have been computed and set down on 
the map. 
From the point B a normal line has been drawn to 
the coast of Norway, at Vesteraalen. Here we have X=535 
kilometres, y = 69°.6, H = 0.8 metre, and get U= 0.215 
metre per second. 
From B a normal line is made to pass along the 
surface-depression in the Barents Sea as far as Jugor Strait, 
Novaja Semlja. Along this depression is assumed a para- 
bolic curve, with its vertex in B and its axis pointing up- 
In the Barents Sea, the current takes the direction 
of the prevailing winds. In the North Sea, this was not 
found to be the case. We have X = 2100 kilometres, 
g = 712°.9, H=0.8 metre, and get at Jugor Strait U= 0.054 
metre per second. According to these data, the points of 
section for the lines of equal height with the normal line 
have been computed. 
From the same normal line, which constitutes the 
current-axis of the Barents Sea, parabolic curves were laid 
straight across the stream-lines to the Norwegian and the 
that 
wards. 
