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Tallene i den sidste Rubrik, den devierende
Misvisning, afsattes som Ordinater paa Rudepapir, med Tallene
i den anden Rubrik, anlagt Kurs paa Standard-Kompas,
som Argument. Paa grafisk Yej droges mellem de afsatte
Punkter den sandsynligste Kurve, og af denne Kurve
udtoges følgende Værdier: C rr Anlagt Kurs efter St.
Kompasset. D rr Devierende Misvisning
The figures in the last column, the deviating
variation, were set down as ordinates on ruled paper, with the
figures in the second column as abscissae. A free hand
curve was then drawn as nearly as possible through all
the marked points, and from this curve were deduced the
following values (C signifies "course by compass;" D,
"deviating variation"): —
C D C D C D C D
N 18. °8 W E 37- "o W f $ I7.°8 W W o."4 W
N io° ’E 2 I •3 S 80° E 37- 4 S 5 io° W 13-8 ’N 80" W i. 6
20 23 . 8 70 37- 3 20 10. 0 70 3- 3
3° 26 . i 60 3&’ 6 30 6 6 60 5- 2
40 28. ■ 4 50 35’ 2 40 3-8 50 7- 2
50 3D . 8 40 33’ 0 50 i. 6 40 9- 4
60 33’ . i 30 30. 0 60 0. 6 30 il. 8
7° 35 . 0 20 26. ■ 5 70 0. i 20 14. 0
80 36 ■ 4 10 22. i 80 0. 0 IO 16.5
Medium af de devierende Misvisninger i denne Tabel er
18.°68 West.
Ifølge Side 7 var Middel-Misvisningen paa Teltpladsen
paa samme Tid 18° 14.’7 = 18".24.
Paa Skjæret østenfor Havnen fandt Prof. Mohn (Sicle
11) den 16de Juni Misvisningen om Formiddagen rr 19°
O’, om Eftermiddagen 18° 2’, i Middel 18° 31’ rr 18°.52.
Da Fartøjet under Svingningen laa mellem Teltpladsen og
Skjæret, turde det være rigtigst at sætte Misvisningen paa
Skibets Plads lig
18.°3S West.
Dette Tal er kun 0.°30 mindre end Middeltallet af
de devierende Misvisninger ombord. Det sidste giver
saaledes den sande Misvisning med en Nøjagtighed af mindst
en halv Grad. Efter dette Princip udførtes
Misvisnings-bestemmelserne i Søen. Til Bedømmelse af Skibets
magnetiske Forhold hidsættes de beregnede Værdier for
Konstanterne i Deviations-Formelen.
The mean of deviating variation in this Table is
18.°68 W.
As previously shown, page 11, the mean declination
simultaneously found at the tent was 18° 14.’7 rr 18."24.
On the islet east of the harbour, Professor Mohn
found the declination in the forenoon of the 16th of June
rr 19° O’, in the afternoon 18° 2’, giving a mean of 18°
31’ rr 18.°52. Now, as the vessel lay when swinging
between the tent and the islet, the declination for-the ship’s
position may be put at
18.°38 W.
This value is only 0.°30 less than the mean of the
deviating variations observed on board. Hence, this mean
gives the true variation within half a degree. On this
principle was determined the variation at sea. To show the
magnetic influence of the vessel, the computed values of
the constants in the deviation formula are here given. —
A = 0.°0: B = — 18.°47; C = — 0.°45: D = -f 2.°47; E rr -f 0.°23.
Deviationen er 0 for anlagt Kurs Nord og Syd,
Maximum, 18.n5, for Ost og West.
Misvisnings-Bestemmelserne i Søen udførtes paa
følgende Maade. Skibet blev, i roligt Vejr og under Solskin,
ved Maskine og Ror bragt til at ligge an forskjellige, i
Regelen 16, Kurser, saa jevnt som muligt fordelte over
hele Horizonten. For hver af disse anlagte Kurser
bestemtes Vinkelen mellem Diametralplanet og Solens Vertikal-
The deviation is 0 with the ship’s head due north or
south, its maximum with the ship’s head due east or west
being 18.°5.
The determinations of declination at sea were
performed as follows: — In calm, bright weather the ship’s
head was brought upon different points of the compass, as
a rule 16, as regularly distributed round the circumference
as possible. For each of these points was determined the
angle between the midship line and the vertical circle of
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