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Tallene i den sidste Rubrik, den devierende Misvis-
ning, afsattes som Ordinater paa Rudepapir, med Tallene
i den anden Rubrik, anlagt Kurs paa Standard-Kompas,
som Argument. Paa grafisk Vej droges mellem de afsatte
Punkter den sandsynligste Kurve, og af denne Kurve ud-
toges Iblgende Yserdier: C — Anlagt Kurs efter St. Kom-
p'asset. D — Devierende Misvisning
The figures in the last column, the deviating‘varia-r
tion, were set down as ordinates on ruled paper, with the
figures in the second column as abscisste. 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, “de-
viating variation”): —
c D C D c D c D
N 00 © 00 W E 37-° 0 w s 17/8 W w 0/4 w
M o o 21. 3 S 8o° E 37' 4 s & 0 0 13-8 N 8o°W i. 6
20 23. 8 70 37- 3 20 10. 0 70 3- 3
30 26. 1 60 36. 6 30 6 6 60 5- 2
40 28. 4 50 35- 2 40 3.8. 50 7- 2
50 30. 8 40 33-0 50 1. 6 40 9. 4
6o 33- 1 30 30. 0 60 6. 6 30 11. 8
70 35- 0 20 26. 5 70 O. I 20 14. 0
8o 36- 4 10 2 2.1 80 O. O IO 16. 5
Medium af de devierende Misvisninger i denne Tabel er
18.°68 West.
Ifolge Side 7 var Middel-Misvisningen paa Teltpladsen
paa samrne Tid 18° 14/7 = 18°.24.
Paa Skjmret ostenfor Havnen fandt Prof. Mohn (Side
11) den 16de Juni Misvisningen om Formiddagen = 19°
O', om Eftermiddagen 18° 2', i Middel 18° 31' = 18°,52.
Da Far to jet under Svingningen laa mellem Teltpladsen og
Skjseret, turde’ det vmre rigtigst at smtte Misvisningen paa
Skibets Plads lig
. 18/38 West.
t
Dette Tal er kun 0/30 mindre end Middeltallet af
de devierende Misvisninger ombord. Det sidste giver saa-
ledes den sande Misvisning med en Nojagtighed af mindst
en halv Chad. Efter dette Princip udfortes Misvisnings-
bestemmelserne i Seen.. Til Bedommelse af Skibets mag-
netiske Forhold hidssettes de beregnede Yserdier for Kon-
stanterne i Deviations-Formelen.
A - 0,°0; B = — 18/47; C =
Deviationen er 0 for anlagt Kurs Nord og Syd,
Maximum, 18/5, for Ost og West.
Misvisnings-Bestemmelserne i Seen udfortes paa fol-
gende Maade. Skibet blev, i roligt Yejr 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 liver af disse anlagte Kurser bestem-
tes Vinkelen mellem Diametralplanet og' Solens Vertikal-
The mean of deviating variation in this Table is
18/68 W.
As previously shown, page 11, the mean declination si-
multaneously found at the tent was 18° 14/7 = 18/24.
On the islet east of the harbour, Professor Mohn
found the declination in the forenoon of the 16th of June
= 19° O', in the afternoon 18° 2', giving a mean of 18°
31' = 18/52. Now, as the vessel lay when swinging be-
tween 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 prin-
ciple 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. —
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 per-
formed 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 eacli of these points was determined the
angle between the midship line and the vertical circle of
— 0/45; D = + 2/47 ; E = -|- 0/23.
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