109 
meddelte Medier for hver anden Time for Maanederne Juni, 
Juli og August findes følgende Afvigelser fra Mediet for 
Kl. 8, 2.0g 8: 
= 010% 0:05 0.11 
altsaa antydende et Formiddagsmaximum og et Eftermid- 
dagsminimum. Af de Side 606 meddelte grafiske Fremstil- 
linger “Tafel IIT 6. Sommer” findes: 
Maximum KI. 11 a.m. 0.137”: Minimum Kl. 6 p.m. —0. 1272, 
5 » 1lpm.+0.08 ; 6 » fam. —0.04 
altsaa en lignende Periode som paa Npidsbergen, men med 
en noget større Amplitude, nemlig 0.””25., 
Paa de isbekrandsede Kyster af Gronlandshavet findes 
altsaa, omend med ringe Amplitude, den sædvanlige daglige 
Periode for Lufttrykket, med noget forsinkede Epoker for 
Vendetimerne, ligesom paa de britiske Kyster. 
Efter *Contributions to our Knowledge of the Me- 
teorology of the Antarctic Regions, Published by the Au- 
thority of the Meteorological Committee, London 1873” 
Side 24 og 26, beregnes for den antarctiske Zone mellem 
60° og 78° Syd Bredde, altsaa nær eller i det antarctiske 
Drivisbelte, for Maanederne Januar og Februar, den ant- 
arctiske Sommer, følgende Afvigelser fra Mediet for KI. 8, 
2 og 8: 
+ 0.02 
HL 002  — 004 
der antyde et Formiddagsmaximum og et Eftermiddags- 
minimum, ganske som 1 de to ovenanførte Tilfælder. Ob- 
servationerne give i Medium for Januar og Februar: 
Maximum Kx]. 3 a.m. + 0.08", Minimum Kl. 6p.m. — 0.12", 
Middag + 0.05 , å Ja.m. + 0.02 
altsaa den sædvanlige Periode med 2 Maxima og 2 Minima 
og en Amplitude af 0.20. 
Betragter man Karterne over Størrelsen af Baro- 
metrets Synkning fra Formiddagsmaximum til Eftermiddags- 
minimum i Alexander Buchan’s “On the Diurnal Oscilla- 
tions of the Barometer, Part I” i Sommermaanederne, saa 
ser man, at den nordligste Linie for Variationen — 0.7010 
= — 0.""25, gjør en stor Bøjning ned i det nordlige Atlanter- 
hav. Den aabner saaledes Rum for et særskilt Parti i det 
norske Hav for sluttede Linier for Værdier med modsat 
Fortegn, det er for et Parti, 1 hvilket Barometret stiger 
fra et Morgenminimum til et Eftermiddagsmaximum. Dette 
Parti findes, som Observationerne fra vor Expedition, fra 
Norges Nord- og Vestkyst og fra Færøerne og Islands 
Østkyst vise, 1 det norske Hay og tilgrænsende Kystpartier. 
Dets Grendselinie gaar i Norge lidt indenfor Kysten, over 
Fjordenes ydre Del, over Midten af Østhavet, og vestenom 
Capt. K. Koldewey in “Zweite Deutsche Nordfahrt IV, 
Meteorologie und Hydrographie,” p. 604, the following de- 
viations are found from the mean for 8”, 2”, and 8”: 
+007 +005  —0.11, 
indicating, therefore, a forenoon maximum and an afternoon 
minimum. From the diagram, p. 606, Pl. IIT b, summer, 
are found — 
Maximum 1! am. + 0.13”"; Minimum 6 p.m. — 0.12™", 
Il pm. + 0.08 ; N 4 am. — 0.04. 
a period, therefore, similar to that at Spitzbergen, but with 
a somewhat greater total range, viz. 0.””25. 
On the ice-bound shores of the Greenland Sea we 
find, accordingly, though with a small range, the usual 
diurnal period for the pressure of the air, — the epochal 
hours being however somewhat retarded, as on the British 
coasts. 3 
From *Contributions to our Knowledge of the Meteo- 
rology of the Antarctic Regions,” published by the Authority 
of the Meteorological Committee, London 1873, pp. 24 
and 26, I have computed for the antarctic zone, between 
60° and 78° 8. lat., accordingly either near or in the ant- 
arctic belt of drift-ice, for the months of January and Feb- 
ruary — the antarctic summer — the following deviations 
from the mean for 8%, 2”, and 8": — 
+ 0.02 — 0.04, 
SL OY 
indicating a forenoon maximum and an afternoon minimum, 
The observations 
give as the mean for January and February — 
precisely as in the two aforecited cases. 
Maximum 3 am. + 0.087”: Minimum 6 p.m. — 0.127", 
i noon + 0,05 ; : %) eam, 01023 
the usual period, therefore, with two maxima and two 
minima, and a total range of 0.”"20. 
If we examine the Plates showing the fall of the ba- 
rometer from the forenoon maximum to the afternoon min- 
Alexander Buchan’s “On the Diurnal 
Oscillations of the Barometer,” Part I, in the summer 
months, the most northerly line, for the variation — 0.7010 
==) mmyY9n 
imum in work 
make a wide bend into the 
northern region of the Atlantic. 
will be seen to 
It leaves therefore ample 
room for a separate tract in the Norwegian Sea, through 
which to draw continuous lines, representing values with 
reversed signs, 1. e. for a tract in which the barometer 
rises from a morning minimum to an afternoon maximum. 
Such a tract, as shown by the observations taken on our 
Expedition, on the north and west coasts of Norway, at the 
Feroe Islands, and on.the east coast of Iceland, actually 
exists in the Norwegian Sea and along the adjacent coasts. 
Its boundary extends from a little within the shores of 
Norway, crossing the outer parts of the fjords, through the 
middle of the Barents’ Sea; it then passes south and west 
of Spitzbergen, east of the east coast of Greenland, across 
