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33
Søbarometret Adie 1493 opbevaredes i sin Kasse paa
Observatoriet i Bergen og opstilledes i Juni 1877 ombord
i "Yøringen" paa samme Plads som tidligere. Dets
Correction controlleredes før. under og efter Rejsen ved
Sammenligning med Stationsbarometer Adie No. 1506, hvis
Correction var fundet i Christiania i April 1877 at være =
— 0."m42, og i Maj 1878 fandtes = — 0.""41. De ombord
i "Yøringen" gjorte Sammenligninger gave følgende
Resultater.
The marine barometer Adie No. 1493, was kept in
its case at the Bergen Observatory, and in June 1877
mounted on board the "Yøringen" in the same place as on
the previous cruise. The correction of the instrument was
controlled before, during, and after the cruise, by
comparison with the station barometer Adie No. 1506, for which
the correction had been found in Christiania, in April 1877,
- _ 0.—42, and in May 1878 = — 0.—41. The
comparisons made on board the "Yøringen" gave the following
results: —
1877. Lufttryk (Pressure). Corr. for Adie No. 1493.
Juni (June) 8 Bergen 759.2’""’ —o.6omm 9 Observationer (Observations).
Aug. 16 Bodø 759-5 —0.52 \
r I? r 758.I —O.52 j —O.54
r 18 „ 757.7 —O.59 J
,. 21 Christiansund 756.7 —0.69 2 —
„ 23 Bergen 753.2 — 0.58
Middel (Mean) 757.5 —0.61 (MF = + o.o6mm)
Reduction til Havfladen (to the Sea-level) +0.13
Correction i (iri) 1877 — 0.48
Søbarometrets Correction synes saaledes at være steget
lidt siden 1876. Observationernes Beregning for 1877
foretoges med den samlede Reduction af — 0."""5.
I 1877 var paa Hyttedækket opsat et Bestikhus (Fig.
1, Fig. 2, h). Inde i dette opsatte jeg, paa den agterste
Væg, et godt Aneroidbarometer, der var forsynet med
Thermometer.
Dette Instrument blev for Fremtiden benyttet af
Iagttagerne til Observation af Lufttrykket. De herved opnaaede
Fordele vare dels, at Iagttageren ikke behøvede at forlade
Dækket, for at udføre de meteorologiske Iagttagelser, dels
at man undgik Tidsspilde, naar Søbarometret pumpede, i
hvilket Tilfælde Aflæsningen af Aneroidbarometret kunde
noteres lige saa sikkert paa 0.m’"l som i roligt Vejr, og
ligesaa hurtigt. Det indskjærpedes Iagttagerne, at notere
Instrumentets Temperatur først, at banke [paa
Aneroidbarometret før Aflæsningen, og at stille sig med Øjet centralt
foran Skiven.
Selv overtog jeg at holde stadig Control med
Aneroidbarometrets Stand. Til det Øjemed observerede jeg,
hver Dag Søen var rolig nok, til at Søbarometret nede i
Arbejdssalonen ikke pumpede og saaledes kunde aflæses
Den norske Nordlinvsexpedition. H. Mohn: Meteorologi.
Hence, the correction of the marine barometer would
appear to have increased slightly since 1876. The
computation of the observations for 1877, were made with the
aggregate reduction of — 0.mm5.
In 1877, a deckhouse (see Fig. 1, Fig. 2, h) was
erected on the spar deck. Here, on the after bulkhead, I
had mounted a good Aneroid barometer, provided with a
thermometer.
This instrument was subsequently used for observing
the atmospheric pressure. The advantages thus obtained
lay partly in the observer not having to leave the deck to
take the meteorological observations, and partly in a
considerable saving of time when rough weather caused the
marine barometer to pump, since the readings of the
Aneroid barometer could in such case be noted as accurately,
within 0.mml, as in calm weather, and as quickly. The
observers were expressly told, first to read off the
temperature of the instrument, to tap the Aneroid barometer
previous to noting its indications, and to have their eye
fixed centrally before the disk.
I undertook myself to keep the error of the Aneroid
at all times controlled. With this object in view, I observed
every day the sea was sufficiently calm to keep the marine
barometer from pumping, and thus admit of its being read
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