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194
Ah-
13.5959
Meter
1000 S„ i—ß eos 2 (p
Uden merkelig Fejl kunne vi her sætte 8„ — 1.027 og
ip zz 70° og faa da
Ah = 0.0132 (ib — 755.7) Meter
eller Havoverfladens Højde over Niveaufladen gjennem dens
dybeste Punkt
h = S + 0.01 —0.0132 (b — 755.7) Meter
hvor S er Strømfladens vertieale Coordinat.
Man faar saaledes for Lufttrykket:
750 mm h = 8 + 0.00(5 m
757 8— 0.007
758 S — 0.020
Beregningen af Overfladens vertieale Coordinate!’ er
udført paa grafisk Vej, idet Tabellens Værdier for
Tilhugget til 8 er anbragt ved Curverne for 8 langs
Meridianerne (de samme, som benyttedes til Construction af
Strømfladen), og den nye Curves Ordinater ere overforte paa
et Kart. Mellem cle saaledes fundne Punkter for
Ordinaterne 0.1, 0.2 til 1.4 in droges, med Vejledning af PI. XLIII,
Ligehøjdelinierne for Havoverfladen i Kartet Pl. XLVIII.
Forskjellen mellem dette Kart og PI. XLIII er ikke stor.
Nordhavet har sit dybeste Punkt i (58°.5 N. Br. og 1°
W. Lgd. Dets Overflade stiger, forst langsomt, senere
raskere, mod Kysterne og naar ved Færøerne op til en
Højde af 0.4 ni, ved Island, Jan Maven og Spidsbergen op
til en Højde af 0.0 ni, ved Finmarken til 0.9 ni, ved
Skotland til 1.0 ä 1.1 ni, ved Novaja Semlja til 1.1 ni. ved
Grønland og ved det sydlige Norge og Jylland til 1.4 ni.
Efter Kartet har Nordsøens Bredder og den vestlige
Del af Østersøen omtrent det samme Niveau1. Dette er
overensstemmende med Resultatet af de nyere
Præcisions-nivellenients. At Østersøen ved Meinel kan staa 0.5 m
højere end ved Svinemünde, synes uden Vanskelighed at
kunne forklares dels ved de herskende Vestenvinde, der løfte
Niveauet op mod disse Kyster, dels ved Virkningen af de store
Elve Oder og Weichsel, hvis Vancl føres østover mod Meinel.
height of the mercury and the true height of the water.
Hence, we must put the depression of the sea-surface at
a point where the density of the water is 8„ and the
pressure b equal to
a , 13.5959 b — 755.7
1000 IS,, 1 - ,1«»2V
Without, appreciable error, we can here take8„ = 1.027
and <f = 70°; accordingly
Ah = O.OI32 (b — 755.7) metre,
or the height of the sea-surface above the surface of level
through its deepest point,
h=S + O.OI -0.0132(jb — 755.7) metre,
in which S is the vertical co-ordinate of the current-surface.
Thus we get for the atmospheric pressure
759 mm h = 8— 0.034 m
760 S — 0.047
7(51 8 — 0.0(50.
The computation of the vertical co-ordinates ol’ the
surface was made diagraminatieally, the values in the
Table for the addition to 8 having been applied at. the
curves for .S’ along the meridians (the same selected for
tin1 construction of the current-surface), and the ord i nates of
the new curve have been transferred to a map. Between
the points thus found for the ordinates 0.1. 0.2 to 1.4 in.,
were drawn, by the aid of PI. XLIII, the lines of equal
height for the sea-surface iu the map Pl. XLVIII. The
difference between this map and PI. XLIII is not great,
The North Ocean has its deepest point in lat, (58°.5
N and long. 1°W. Its surface rises, at first slowly,
afterwards more rapidly, as it approaches the coasts, and
reaches at the Færoes a height of 0.4 in., at Iceland. Jan
Mayen, and Spitzbergen a height of 0.(5 in., at Finmark
of 0.9 in., at Scotland of 1.0 to 1.1 in., at Novaja Semlja
of 1.1 in., at Greenland. Southern Norway, and the coast
of Jutland of 1.4 m.
According to the map, the shores ol’ the North Sea
and the western part of the Baltic lie nearly at the same
level.1 This result is in accordance with the latest
level-lings of precision. That the surface of the Baltic at
Memel may be 0.5 m. higher than its surface at
Swine-miinde, admits, it would appear, without difficulty of being
explained, in part by the prevailing westerly winds, that
raise the level against these coasts, in part by the effect
’ 1 must lion* expressly remark, that the computation ut’ the
currents, etc.. in the North Sea has heen merely undertaken as an
attempt to {jive a more complete representation iu the maps. A
more rigorous examination, based on all available observations, in
particular those referring to temperature and salinity, will bo
attended with results that in several respects may correct my estimated
computations. The work published by the German Admiralty -Die
Ergebnisse der rntersuchungsfahrten S. M. Ivnbt. "Draclie" ((’apt.
Hokhaueri iu der Nordsee in den Sonnnern I SSI, lss-2 u. lss:i."
did not reach me till the above had been written, (ionerally, the
observations from the "Draclie" seem to agree well with our theory of
ocean-circulation.
1 .Teg vil her udtrykkelig bemerke, at. Beregningen af
Strømningerne ni. in. i Nordsøen kun er udført forsøgsvis, for at kunne
gjöre Fremstillingen i Karterne noget fuldstændigere. En strengere
gjennomført Undersøgelse efter samtlige tilstedeværende Iagttagelser,
navnlig af Temperatur og Saltholdighed, vil kunne give Resultater,
der i Here Retninger kunne eorrigere mine Overslagsberegninger.
Det af det tyske Admiralitet udgivne Verk ’Die Ergebnisse der
l’n-tersuchungsfahrten S. M. Kubt. - Draclie |Capt. Holzhaueri in der
Nordsee in den Soniine.ru 1SSI, iss-j u. I8s;i" kom mig først ihænde,
efterat ovenstaaende var nedskrevet. I det. hele taget synes
Observationerne fra "Draclie" at stemme vel med vor Strointhcori.
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