118 
æquatoriale Stillebeltes Lufttrykdepression, til det Resultat, 
at Virkningen af de ulige specifiske Vægter paa Strømmens 
Hastighed forøger denne søndenfor Æquator i Square 301, 
302 og 303, og formindsker den nordenfor Æqvator i Square 
38, 39 og 40, hvad der ogsaa harmonerer med Tallene i den 
følgende Tabel, idet samme Vindstyrke søndenfor Æquator 
giver en større Hastighed end nordenfor. Herved compen- 
seres tildels Virkningerne i Middeltallet. 
Af Diagrammerne i Meteorological Data udtoges de 
Tilfælder, da den midlere Vindretning og den midlere 
Strømretning vare overensstemmende eller næsten overens- 
stemmende, og noteredes Vindens midlere Styrke efter 
Beaufort Skala samt Strømmens midlere Hastighed i Kvart- 
mile (60 å I Grad) 1 24 Timer. 
Middel for hver Maaned. Disse Media ere opførte i den 
følgende Tabel samt Antallet (N) af Tilfælder, af hvilke 
de ere beregnede. 
Af disse Talrækker toges 
Square | 38. 39. 40. | 2 ab 
Bredde. 10°—20° N. 0°—10° N. 
| Vind Strøm N. | Vind Strøm N. 
Januar | 4.8 II 18 | 3.4 20 8 
Februar 4.3 11 aS || Q08 5 10 
Marts 4.3 10 16 3.4 15 12 
April 4.2 me, WS 3.8 16 II 
Maj 4.4 10 19 32 16 9 
Juni 4.3 12 19 3.3 21 IO 
Juli 3.8 12 18 3.8 24 8 
August Bo) 13 12 3.9 23 7 
September 3.7 12 13 Bo 17 4 
October 3.0 12 16 Fog 15 8 
November 3.8 12 16 3.9 19 9 
December 4.3 II 18 2.7 18 7 
Aar 4.1 I I 198 3.5 18 103 
| We C No | Wa C. N. 
Tages Middel af Tallene i Horizontalrækken *Aar”, 
idet de gives Vægt efter Antallet af Tilfælder, faar man, 
at en Vindstyrke efter Beaufort Skala af 3.9 giver en 
Strømhastighed af 15 Kvartmil i 24 Timer. Antallet af 
de Tilfælder, der ere benyttede til Beregningen, er 658. 
For at omgjøre Vindstyrken efter Beaufort Skala til 
Vindhastighed har jeg benyttet Scotts Tabel!. Efter denne 
svarer en Vindstyrke af 3 til en Hastighed af 18 miles an 
' An Attempt to establish a Relation between the Velocity of 
the Wind and its Force (Beaufort Scale), with some Remarks ete. 
by Robert H. Scott, F.R.S. Quarterly Journal of the Meteorolo- 
gical Society, Vol. IT, No. 11, S. 114. 
pay regard to specific gravity. For the rest, a consideration 
of the Guinea Current, which, with its easterly course on the 
northern hemisphere, indicates a depression of the sea-level 
corresponding in position to the barometric depression of the 
equatorial calm belt, leads to the result that the effect of 
the unequal specific gravities on the velocity of the current 
increases that velocity south of the equator in Squares 301, 
302, and 303, and decreases it north of the equator in 
Squares 38, 39, and 40; nay, this is found to agree with 
the figures in the following Table, since the same force 
of wind south of the equator imparts a greater velocity 
than north of it. Thus the various effects are to some extent 
compensated in the mean result. 
From the Diagrams in “Meteorological Data,” I ex- 
tracted all cases showing the mean direction of the wind 
and the mean direction of the current to coincide or to 
almost coincide, and noted the mean force of the wind 
according to Beaufort Scale (W), as also the mean rate 
of the current in nautical miles (60 to 1 degree) per 
twenty-four hours (©). Of these series of figures, I took 
the mean for every month. These means are given in the 
following Table, together with the number (N) of cases 
from which they were computed. 
3, | 301. 302. 303. Square 
0°—10° N. | 0°—10° S. Latitude 
Vind Strøm N. | Vind Strøm N. | 
3.2 L4 17 4.0 15 20 | January 
3.3 14 18 3.8 15 12 | February 
Bon 12 13 3.5 15 , 13 | March 
3.0 16 12 3.4 15 20 | April 
3.0 14 14 4.0 16 21 | May 
3.5 21 9 4.3 17 20 | June 
3.6 21 7 4.4 18 20 | July 
4.0 19 10 4.4 16 19 | August 
3.3 16 IO 4.5 16 19 | September 
FG 13 6 4.4 14 16 | October 
3.7 14 8 4.3 14 16 | November 
3.4 14 18 4.2 T5 19 | December 
REG: 15 142 4.1 i 2K | Year 
| 
MOENS SNE 
Now, if we take the mean of the figures in the hor- 
izontal series, “Year,” giving them weight im proportion 
to the number of cases, the result will be, that a wind 
of a force according to Beaufort Scale of 3.9 produces a 
velocity of current equal to 15 nautical miles in 24 hours. 
The number of cases made use of for the computation 
is 658. 
In order to convert the force of the wind according 
to Beaufort Scale to its velocity, I had recourse to 
Scott’s Table." According to this Table, a wind-force of 3 
1 An Attempt to establish a Relation between the Velocity of 
the Wind and its Force (Beaufort Scale), with some Remarks, etc., 
by Robert H. Scott, F. R.S. Quarterly Journal of the Meteorologi- 
cal Society, Vol. IT, No. 11, p. 114. 
