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118
æquatorialc Stillebeltes lufttryk-depression, til dpt Resultat,
at Virkningen af de ulige specifiskc Vægter paa Strømmens
Hastighed forliger denne söndenfor 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 söndenfor Æquator
giver en s torre 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
overensstemmende, og noteredes Vindens midlere Styrke efter
Beaufort Skala samt Strømmens midlere Hastighed i
Kvartmile (00 il 1 Gradi i ’.’4 Timer. Af disse Talrækker toges
Middel for hver Maaned. Disse Media ere opførte i den
følgende Tabel samt Antallet (N) af Tilfælder, af hvilke
de ere beregnede.
pay regard to speeific 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, loads 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, 30, and 40; nay. this is found to agree with
the figures in the following Table, since the same force
øf willd south of the equator imparts a. greater velocity
than north of it. Thus the various effects are to some extent
compensated iu the mean result.
From the Diagrams in "Meteorological Data," 1
ox-tracted all eases 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
øf the current in nautical miles (80 to 1 degree) per
twenty-four hours (C). Of these series of figures. 1 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.
Square :»». 4U. 4. :>oi. 10-2. 30:i. Squar»
BreiUle. Hi" •_>(’" X ti" nr X (>"- -1(1" X. øn- 10" S. Latitat!
Viin 1 Strom X. Viral Strøm X. Vincl Strøm X. Yin.l Strom X.
Januar 4.8 11 i8 34 20 8 3-2 ’4 17 4.0 15 20 January
Februar 4-3 11 18 3-5 15 IO 3-3 14 18 3-8 15 12 February
Marts 4-3 16 3-4 <5 12 3-i 12 ’3 3-5 >5 ’3 March
April i 4-2 11 i8 3-8 16 ii 3-0 16 12 3-4 15 20 April
Mai 4-4 10 ’9 3-2 16 9 30 l4 14 4.0 16 21 May
Juni 4-3 ’ 1 2 ’9 3-3 2 r io 3-5 •21 9 4-3 17 20 June
Juli 3-8 1 2 18 3-8 24 8 3-6 21 7 4-4 18 20 .1 uly
August 3-6 ’3 1 2 3-0 23 7 4.0 !9 io 4-4 16 19 August
September 1 2 •3 3-5 17 4 3-3 16 IO 4-5 16 19
October 3-9 12 16 3-3 "S 8 3-5 ’3 r> 4-4 14 >6 October
November 3-8 i 2 i6 3-9 19 9 3-7 14 8 4-3 14 16 Xovembt
December 4-3 1 1 2-7 18 7 3-4 14 18 4.2 15 19 Decembe
Aar 4-’ i 1 98 3-5 18 03 3-3 15 42 4-1 16 215 Year
W’. 0. X. W. C. X. W. C’. X. W’. (’. X.
Tages Middel af Tallene i Horizontalrækki.....Aar",
idet de gives Vægt efter Antallet af Tilfælder, faar man,
at ell 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 058.
For at omgjøre Vindstyrken efter Beaufort Skala til
Vindhastighed liar jeg benyttet Scotts TabelEfter denne
svarer ell Vindstyrke af 3 til en Hastighed af 18 miles an
Now, if we take the mean of the figures in the
horizontal series, "Year," giving them weight in proportion
to the number of cases, the result will lie, 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.1 According to this Table, a wind-force of 3
1 An Attempt to establish a Relntinn between the Velocity of
the Wind mul its Force (Beaufort Srtilo;. with some Remarks etc.
by Robert 11. Scott, F. li. S, Quarterly Journal of tin’
Meteorological Society. Vol. 11. N’o. It. S. 114.
1 An Attempt to establish a Relation between the Velocity of
the Wind ami it- Force iBoaufort Sealci. with some lieinarks, etc.,
by Robert H. Scott, F. R. 8. Quarterly Journal of Ilm
Meteorological Society, Vol. II. N’o. II, p. I1J.
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