Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
38
1878. Lufttryk (Pressure). Corr. for Adie 1493.
Juli 8 Hammerfest 759.4— — 0.58""
(My) ,. — 0.64
9 60.3 — 0.61
r IO r 59-1 — 0.82
r H r 58.4 — o.6g
r 13 55-3 — 0-73
,. 26 56.1 — 0.60
r 27 59-9 — 0.57
i’ 1; f 60.3 — 0-57
v 29 62.0 — 0.66
f r r 62.1 — 0-75
Aug. 22 Advent Bay 49-3 — 0.79
r r f 49-4 — 0.87
„ 27 Tromsø 53-7 — 0.68
,. r 540 — 0-57
,28 ,. 55-9 — 0.49
Middel (Mean) 757-2 — 0.66 (MF = + 0.09").
Reduction til Havfladen (to the Sea-lerel) + 0.13
Correction i (in) 1878 — 0-53
Søbarometrets Correction synes saaledes fremdeles at
være steget ganske lidt siden 1877. Til Beregning af
Observationerne fra 1878 er anvendt Correctionen — 0.mm5,
som i 1877.
Det samme Aneroidbarometer, som brugtes i 1877,
opstilledes i J 878 paa samme Plads. Det controlleredes
ganske paa samme Maade som Aaret forud, og benyttedes
til de daglige timevise Iagttagelser.
Den 11te August, mellem Kl. 1 og 2 p. m. blev jeg
gjort opmerksom paa. at Viseren paa dette
Aneroidbarometer — som jeg kalder Aneroid A —, der om
Formiddagen og indtil Kl. 1 Eftm. havde vist, med smaa
Variationer, 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 første Observation
med B, Kl. 2 Eftm. og de følgende Observationer viste et
Sprang mellem Kl. 1 og 2 af l.mm5 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
elimineres, og herefter rettedes de Observationer, der falde
mellem disse Klokkeslet.
De følgende Tabeller indeholde Resultaterne af de
Sammenligninger, der i 1878 tjente til at controllere
Aneroidbarometrene og til at beregne Formelen for deres
Reduction til sand Barometerhøjde ved Havets Overflade.
The correction of the marine barometer would,
therefore, appear to have still risen very slightly since 1877.
For computing the observations taken in 1878, I have
applied the correction —0.mM5, 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 instrument Aneroid A), which during the whole
forenoon and as late as 1 p. m. had pointed, with but trifling
variations, a trifle above 754mm, having suddenly sprung up
to a little above 770m"1. 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
observations, showing between I and 2 p. m. a sudden fall of l.mm5,
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
comparisons 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.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
