Fejlen i Observationsklokkeslettet ved Middag er størst, 
—20.”5, den 28de Juli og næststørst, — 9.71 den 4de 
August. Summen af positive Fejl er 2.”1, fordelt paa 3 
Dage eller 0.77 pr. Dag. Summen af negative Fejl er 
— 37.76, fordelt paa 4 Dage, eller — 9.74 pr. Dag. Den 
gjennemsnitlige Fejl bliver — 35.5, fordelt paa 9 Dage (2 
Dage til Ankers under Jan Mayen) eller — 3.79 pr. Dag. 
a. 
Klokkeslet Te på Bu 4th BR 6” 
Corr. Obs.media QB] BAB 283 BO. BAD PG) 
Afv. fra Dagsmedium -— 0.73 —o0.67 —0.87 —0.80 —0.63 —o.41 —0:2.1 
Beregnet Afvigelse --0.73 —0.78 —o.80 —0.76 —0.64 —0.44 —0.19 
m. 
The error in the hour of observation at noon bad 
its greatest value, — 20.75, July 28th, and its next greatest, 
— 9.1, August 4th. The sum of the positive errors is 2.” 1, 
distributed over 3 days, or 0.”7 per day. The sum of the 
negative errors is — 37.76, distributed over 4 days, or — 9.4 
per day. The average error is thus —35.”5, distributed 
over 9 days (2 days at anchor off the coast of Jan Mayen), 
or — 9.79 per day. 
Re 8” 9” no? nn na’ Hour. 
AIX) 8 3080 388 302 B89 Com, dos, means, 
0.08 0.21 0.45 0.52 0.73 Diff. from daily mean. 
0.05 0.26 0.42 0.55 0.68 Computed difference. 
Forskjel: Obs. — Ber. 0.00 0.11 —0.07 —0.04 0.01 0.03 —0.02 003 —0.05 0.03 —0.03 0.05 Diff.: obs. — comp. 
p.m. 
Corr. Obs.media FOL 00 400 03 30 330 UG FOX 273 260 283 237 Co, Obs menns, 
Afv.fraDagsmedium 0.82 0.86 0.90 0.83 0.79 0.26 0.03 -—-0.07 —0.32 —0.50 —0.57 —o.73 Diff.from daily mean. 
Beregnet Afvigelse 0.81 0.91 0.93 0.84 0.64 0.37 0.10 —0.15 — 0.34 —0.48 —0.58 —0.66 Computed difference. 
Forskjel: Obs. — Ber. 0.01 —0.05 — 0:03 —0:0I 0.15 —0.II —0.07 0.08 0.02 —0.02 0.01 —0.07 Ditf.: obs. — comp. 
Formel (Formula). t= 3.010 —0.0850 sin (61° 41.8 + #) + 0.0055 sin (22° 37’ +. 24) 
+ 0.0076 sin (86° 10’ + 3t) — 0.0013 sin (96° 23’ +. 4t) 
Figuren Pl. I, Luftens Temperatur 1877 B, Polar- 
Strommen, viser, at den beregnede Curve slutter sig godt 
MF = + 0.0046. 
Efter Formelen beregnes: 
Minimum: —0.°81, 2”53"a.m., Maximum: + 0.093, 2"42" p.m. 
Medium indtretter 7 46” am. og 7 22” p.m. 
Amplitude: 1.°74. 
Den forholdsvis store Amplitude, som saaledes er fundet 
til den observerede. 
1 Polarstrommens Strog, synes hovedsagelig at hidrore fra den 
senere Aarstid, i hvilken Observationerne her ere tagne. 
De faa Dage af August, som Expeditionen brugte paa Til- 
bagereisen til Norge, nemlig den 6te til 10de August, ud- 
vise en endnu storre Amplitude end den ved Jan Mayen 
fundne. Observationerne fra disse faa Dage, af hvilke der 
kun vilde være 4 hele Dogn til Disposition for Beregning 
af den daglige Periode, har jeg ikke villet slaa sammen 
med de tidligere udenfor Norges Kyst tagne, da de repræ- 
sentere en temmelig forskjellig Aarstid. Til en selvstændig 
Beregning er Dagenes Antal forekommet mig for ringe. 
1878. 
Den første Gruppe omfatter Expeditionens 2 første 
Ture, fra Slutningen af Juni til henimod Slutningen af 
The figure in Pl. I, Temperature of the Air, 1877 B, 
Polar Current, shows that the computed curve agrees well 
with that observed. MF = + 0.046. 
From the formula is computed — 
Minimum — 0.981, 2” 58” a.m.; Maximum + 0.°93, 2% 42” p.m. 
The Mean occurs at 7’ 46” a.m. and 7 22” p.m. 
Total Range: 1.°74. 
The comparatively extensive range thus found from 
the observations taken within the limits of the Polar cur- 
rent, would appear to be chiefly a result of the late season 
of the year. The few days in August passed on the return 
ot the Expedition to Norway, viz. from the 6th to the 10th 
of that month, exhibit a still greater oscillation than that 
found from the observations off Jan.Mayen. The observa- 
tions made on this limited number of days, of which only 
4 whole ones could be devoted to computing the diurnal 
period. I have not seen fit to group along with those 
previously taken off the Norwegian coast, representing as 
they do a comparatively different season of the year. To 
form a separate group, I have deemed the number of days 
too small. 
1878. 
The first group comprises the observations taken on 
the 2 first cruises of the Expedition, from the end of June 
