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31
2. Lufttryk.
Til Expeditionen anskaffedes to Søbarometre af Adie
i London. De bleve verificerede ved Observatoriet i Kew,
hvor der fandtes følgende Correctioner:
I Løbet af Taaren 1-S76 sammenlignedes begge disse
Barometre paa det meteorologiske Institut i Christiania med
dettes Normalbarometer,1 hvis Correction til sand
Barometerhøjde antages at være + O.""" 18. Kun Barometret Adie
1493 kom til Anvendelse paa Expeditionen, medens 1494
tjente som Reserve. Den sidste Række Sammenligninger i
Christiania gav følgende Resultater.
2. Atmospheric Pressure.
For the Norwegian North-Atlantic Expedition two
marine barometers were procured, by Adie. of London.
They were verified at the Kew Observatory, and the
fol–lowing corrections found: —
Correction ved (at) 720""" 730""" 740""" 750""" 760""" 770""" 780""’’
Adie 1493 —0.15""" —0.15""" —o.iomm —0.10""" —0.05’"™ —0.05""" —o.oomm
„ 1494 —0.25 —0.25 —0.25 —0.20 —0.20 —0.20 —0.20
In the spring of 1876, both these barometers were
compared with the standard barometer1 of the
Meteoro-I logical Institute in Christiania, the correction of the latter
I instrument to true barometric pressure being taken at
I o.m,nl8. Barometer Adie No. 1493 only was made use
of on the Expedition, No. 1494 serving as a reserve
instrument. The last series of’ comparisons undertaken in
Christiania gave the following results: —
Dag (Day). Lufttryk (Pressure). Correction for Adie No. 1493.
1876. Marts 21 760.7 ■■ — 0.44—
21 59-7 — 0.60
22 56-5 — 0.54
23 48.6 — 0.47
24 53-8 — 0 42
25 60.5 — 0.49
27 551 — 0.41
30 51.0 — 0.26
3" 55-5 — 0.42
Middel (Mean). 755-7 — 0.45
Middelfejl af en enkelt Sammenligning (MF) = +
0.mm07.
For Adie 1494 fandtes paa samme Tid Correctionen
= — 0."’m59 med en Middelfejl af en enkelt
Sammenligning = + 0.mm07.
Vore Correctioner ere saaledes henimod — 0."""4
forskjellige fra Kew-Correctionerne.
Tidligere Sammenligninger Vinteren 1875—1876 i
Christiania tydede hen paa, at Correctionerne ved lavere
Lufttryk vare mindre end — 0.mm4ö. Hertil er ved
Observationernes Reduction i 1876 taget Hensyn, idet
Correctionen ved 740""" er regnet lig — 0.mm2.
Barometret Adie 1493 ophængtes ombord i "Vøringen"
i Arbejdssalonen, midtskibs paa Forskuddet. Det havde
der en sikker Plads, bekvem for Observation og med godt
Lys fra Skylightet foroven. Denne Plads (Fig. 4, x) beholdt
The mean error of a single comparison (MF) = +
0.""07.
For Adie No. 1494, the correction was simultaneously
found — 0.mm59, with a mean error for a single
comparison = + 0.mm07.
Our corrections differ accordingly about —■ 0.inm4 from
the Kew corrections.
Previous comparisons, undertaken during the winter
1875—1876, were such as to indicate, that the corrections
at lower atmospheric pressure were less than — 0.mm45.
To this circumstance regard was had in 1876, the
correction for 740mm having been put equal to — 0.mm2.
Barometer Adie No. 1493 was mounted in the
workroom of the -’Vøringen," amidships on the fore bulkhead.
There it had a secure position, was easy to observe, and was
well lighted from above through the skylight. This place
1 Om dettes Correction se Jahrbuch des norwegischen
meteo-rologischen Instituts fur 1874, Vorwort S. 1.
1 In regard to the correction of this intrument, see "Jahrbuch
des norwegischen Instituts" für 1874. Vorwort, S. 1.
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