38 
1878. Lufttryk (Pressure). Corr. for Adie 1493. 
Juli 8 Hammerfest 759.47 Ore 
(July) , å 59.7 — 0.64 
9 3 60.3 — 0.61 
10 59.1 — 0.82 
a Tol '; 58.4 — 0.69 
Su ALS E 55-3 = 0:73 
~ 20 5 56.1 — 0.60 
Høeg 59:9 = 0:57 
5 Å 60.3 ossy, 
20 å 62.0 — 0.66 
- å 62.1 — 0.75 
Aug. 22 Advent Bay 49:3 — 0.79 
g » 49.4 — O97 
-. ag  dinonsyss 53:7 — 0.68 
oh op 3 54:0 — 0.57 
” 28 ” 55:9 — (05419) 
Middel (Mean) 757-2 —0.66 (MF=+ 0.00"). 
Reduction til Havfladen (to the Sea-level ) Le Org 
Correction i (nm) 1878 = 0.83 
Søbarometrets Correction synes saaledes fremdeles at 
være steget ganske lidt siden 1877. Til Beregning af Ob- 
servationerne fra 1878 er anvendt Correctionen — 0.”"5, 
som 1 1877. 
Det samme Aneroidbarometer, som brugtes i 1877, 
opstilledes i 1878 paa samme Plads. Det controlleredes 
ganske paa samme Maade som Aaret forud, og benyttedes 
til de daglige timevise Jagttagelser. 
Den lite August, mellem Kl. 1 og 2 p.m. blev jeg 
gjort opmerksom paa, at Viseren paa dette Aneroidbaro- 
meter — som jeg kalder Aneroid A —, der om Formid- 
dagen og indtil Kl. 1 Eftm. havde vist, med smaa Varia- 
tioner, paa lidt over 754””, pludselig var sprungen til over 
770”. Nogen ydre Foranledning hertil kunde ikke opdages. 
Et andet Aneroidbarometer, som jeg kalder Aneroid B, af 
samme Construction som A, opstilledes istedetfor dette og 
benyttedes til Rejsens Ende. Da den forste Observation 
med B, Kl. 2 Eftm. og de følgende Observationer viste et 
Sprang mellem Kl. 1 og 2 af 1.””5 Fald, der var højst 
usandsynligt efter Barometrets rolige Gang forresten, antoges 
A at have forandret sin Correction jevnt med Tiden fra 
Kl. 2 Morgen af, til efter Kl. 1, saaledes at Spranget elimi- 
neres, og herefter rettedes de Observationer, der falde 
mellem disse Klokkeslet. 
De følgende Tabeller mdeholde Resultaterne af de 
Sammenligninger, der i 1878 tjente til at controllere Ane- 
roidbarometrene og til at beregne Formelen for deres Re- 
duction til sand Barometerhøjde ved Havets Overflade. 
The correction of the marine barometer would, there- 
fore, appear to have still risen very slightly since 1877. 
For computing the observations taken in 1878, I have 
applied the correction —0.””5, as in 1877. 
The Aneroid barometer used in 1877 was again 
mounted in the same place in 1878. It was controlled 
precisely in the same manner as the year before, and used 
for the hourly observations. 
On the 11th of August, between 1 and 2 p.m., my 
attention was called to the hand of the Aneroid barometer 
(I shall call this mstrument Aneroid A), which during the whole 
forenoon and as late as 1 p.m. had pointed, with but trifling 
variations, a trifle above 754””, having suddenly sprung up 
to a little above 770””. No external cause to account for 
this could be detected. Another Aneroid barometer, which I 
shall call Aneroid B, of the same construction as Aneroid 
A, was mounted in place of the latter and used throughout 
the remainder of the cruise. The first observation with 
Aneroid B, taken at 2 p.m. and the following observa- 
tions, showing between I and 2 p.m. a sudden fall of 1.75, 
exceedingly improbable considering the slight variation of 
pressure before and after, Aneroid A was assumed to have 
uniformly changed its correction during the interval from 2 
a. m. till after 1 p. m., thus eliminating the fall; and hence 
the observations taken between the said hours were brought 
in accordance with this supposition. 
The following Tables contain the results of the com- 
parisons which in 1878 served to control the readings of 
the Aneroid barometers, and to compute the formula for 
their reduction to true barometric pressure at the sea- 
level. 
