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B. Observations! i Snen og deres Eesultater.
Yecl Expeditionens Udrustning var det paatsenkt, at
der skulde gjpres fuldstaendige magnetiske Observationer
ombord, naar man var i Seen. Hertil bavdes fuldstmndigt
Apparat i Admiralitets Standard-Kompasset og Fox-Cir-
kelen. Med denne sidste foretog jeg i 1876, under Skibets
Udrustning, paa Bergens Observatorium de nodvendige Af-
vejninger. Under Expeditionens Opliold i Huso fra den
lOde til 19de- Juni samme Aar gjordes alle de fornodno
Basis-Observationer. De magnetiske Elementers Storrelse
bestemtes, som ovenfor vist, i Land ved absolute Maalifiger.
Deviationen bestemtes saavel for Styre-Kompasset som for
Fox-Cirkelens Plads og med Fox-Cirkelen nma'ltes Inkli-
nation og Intensitet under forskjellige anlagte Kurser, idet
Skibet blev svunget ved Hjajlp af Trosser. Der toges
Svingnings-Observationer til Bestemmelse af Coefficienterne
fl og 1.
Ved Beregningen af de med Fox-Cirkelen ombord
maalte Inklinationer og Intensiteter, fandt Prof. Molm, at
disse ikke kunde bringes til indbyrdes Harmoni, med mindre
Indexfejlen for Fox-Cirkelens Naal sattes bele 19 Minuter
storre, end den'fandtes af de Observationer, der var gjorte
i Land paa samme Sted og til sanime Tid med Fox-Cirke-
len og med Inklinatoriet.
• ’
. Da vi den 22de Juni 1876 i mege't roligt Vejr og
rolig So forsogte Observationer med Fox-Cirkelen, viste det
sig, at Skibet, vel nsermest paa Grund af det langsomt
virkende Styreapparat,1 ikke kunde holdes paa Kurs med
den Stohed, som udfordredes. til at Observationerne kunde
gjores med nogenlunde Nojagtiglied, ligesom Skibets verti-
ka'le Bevaegelser uagtet den rolige So viste sig yderst kin-
drende i sanime Retning. Beregningen af Observationerne
gav ogsaa et utilfredsstillende Resultat. -Kun en Gang
senere forsogtes, nemlig under Sejladsen ind til Thorsha-vn,
Observationer med Fox-Cirkelen. Det yderst urolige Vejr,
som Expeditionen bavde i 1876, forbod alle videre Forsog
i dette Aar.
I 1877 kindred.e saavel Yejret, som den Omstsendig-
hed, at jeg maatte gaa fra Huso til Bergen for at faa ind-
sat ny Mellemaxel i Maskinen, mig i at foretage Basis-
Observationer. I 1878 var Expeditionen under Rejserne
saa ganske optagen af andre mere nodvendige Gjoremaal,
at der ikke levnedes Tid til at tage andre magnetiske Ob-
servationer ombord end til Bestemmelse af Misvisningen.
Saaledes forenede sig Skibets magnetiske Konstitution,
om jeg saa maa kalde det, dets langsomtvirkende Styre-
apparat, dets Letbevsegeligbed og ringe Bredde, uroligt
Vejr, Reparation af Maskinen og Hensynet til Expeditio-
nens Hovedarbejder, Lodninger, Temperaturmaalinger og
Skrabninger, til absolute Hindringer mod Fox-Cirkelens
B. Observations at Sea, and their Results.
Tbe Scheme of Work approved for the Expedition
included complete series of magnetic observations at sea,
for which we had the Admiralty standard compass and the
Fox circle. With the latter instrument, I undertook in
1876, at the Bergen Observatory, whilst the ship was
fitting out, the necessary weighings. During the stay of
the Expedition at Huso, from the 10th to the 19th of June,
same year, were taken all necessary base-observations. The
deviation was determined alike for the steering-compass and
the position of the Fox circle, and inclination. and intensity
were observed with the Fox circle on different courses, the ship
being swung the while by means of hawsers. Observations
of vibration were taken to determine the coefficients it and l.
In his computations of inclination and intensity ob-
served on board with the Fox circle, Professor Molm could
not, he found, attain satisfactory agreement for the respec-
tive results unless the index-error for the needle of the
Fox circle were put as much as 19 minutes greater than
the error found from the observations taken on shore in
the same place and at the same time with the Fox circle
and with the dip circle.
On taking'a few preliminary observations with the Fox
circle, June 22nd 1876, in very fine weather and a calm
sea, it was found impossible, chiefly no doubt owing to tbe
tardy action of the steering-apparatus,1 to keep the ship
sufficiently steady on her course for observing with com-
parative accuracy; moreover, the vertical motion of the
vessel, calm as was the sea, proved a serious obstacle to
the attainment of anything like trustworthy determinations.
The computed results, . too, were not to be relied upon.
Only once afterwards, viz. when nearing Thorshavn. did
we try to observe with the Fox circle; indeed the boister-
ous weather encountered by the Expedition throughout the
summer of 1876, precluded any further attempt on the
first cruise.
In 1877 I had no opportunity of taking base-obser-
vations, both by reason of the weather and the discovery,
on arriving at Husp, of 4 defect in the engine-shaft, necessi-
tating our immediate return to Bergen to get a new one
put in. In 1878 the prosecution of other and more im-
portant exploratory work left no time for magnetic obser-
vations save those required to determine declination.
Thus, the ship's magnetic properties, so to speak, the
slow action of her steering-apparatus, her great mobility
and trifling breadth of beam, rough weather, time lost in
repairing the engine, and regard to the main objects of
* the Expedition, viz. sounding, determining temperature, and
dredging tbe bottom, — proved one with the other in-
1 C. Wille. Apparaternc og- deres Brug. Side 4.
1 C. Wille. The Apparatus, and How Used, p. 4.
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