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schen Ocean die Beobachtungen von Elliot, stündlich von 3 Uhr Morgens bis 9 Uhr Abends, für die Aequatorialgegend die von Dupetit Thouars, St. 4. 8. 12. 4. 8. 12., für das südliche Polarmeer James Ross, für das nördliche Polarmeer Sutherland, Belcher, Kane und Armstrong. Wegen der geringen Verbreitung grösserer Reisewerke theile ich diese Daten hier mit. Bei sämmtlichen Polar-Expeditionen tritt der abkühlende Einfluss des Eises im Sommer eben so deutlich hervor, als der Schutz der mächtigen Eisdecke für das darunter befindliche Wasser gegen die furchtbare Kälte der auf der Eisfläche ruhenden Luft.

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Elliot, Magnetic Survey of the Indian Archipelago. Ph. Tr. 1851, p. 311.

September
September

78.4

79.3 0.9

79.2

79.2 0.

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Dupetit Thouars, Voyage de la Vénus. Physique. Stündlich.

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24. Jan.-16.Fbr. 26.23

26.31

0.08

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26.25 0.26

3.-17. Juli 23.21

23.47 0.26

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18.-28. Juli

24.37

24.95

0.58

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St. 4. 8. 12. 4. 8. 12. Duperrey, Voyage autour du monde. Physique, p. 260.

3.-22. Mai

27.07

27.07 0.

25. Mai 9. Juni

27.48

27.23

-0.25

12.-21. Aug.

27.82

28.05

0.23

6.-16. Sept.

27.95

28.75 -0.20

23. Sept.-2.Oct. 26.92

28.02

1.10

4.-28. Oct.

28.42

28.02

-0.40

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James Ross, A Voyage of Discovery and Research in the Southern and

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1827 Mai

Meer von Grönland

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Juni.
Juli

August

77 45 11 50 O.
79 44 15 53
Hecla Cove 79 55 16 48
79 46 13 30
Sept. 1.-10. Meer von Grönland 68 14 1 3
Juni 25.-10.A.
62 3
Mittel 77 54

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20 30

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13 25

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Sutherland, Journal of a Voyage in Baffins Bay the years 1850, 1851. Vol. II. App. p. 176.

30.8 36.0 5.2

| 40.4 | 42,8 | 2.4 and Barrow Straits in

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Belcher, The Last of the Arctic Voyages being a Narrative of the Expedition in H. M. S. Assistance. Vol. II, p. 307.

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Kane, The U. S. Grinnell Expedition in search of Sir John Franklin 541.

p.

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Armstrong, A Personal Narrative of the Discovery of the North West Passage p. 601.

Ueber die Gröfse der Veränderung in der jährlichen Periode hat Dana die vollständigsten Daten geliefert in seiner Abhandlung „on the Geographical Distribution of Crustacea" p. 1483. Daselbst findet sich eine Tafel, in welcher die mittlere Temperatur der wärmsten und kältesten auf einander folgenden 30 Tage gegeben wird. Die folgende Tafel enthält diese Extreme in Réaumur'scher Skala mit Hinzufügung der Gröfse des Spielraums.

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