Jökull - 01.12.1993, Side 60

N.N. 1884. MagnetischeBeobachtungenauf undbei Island.
Annalen der Hydrographie Bd. XII, 572 (tekið upp úr
"Notice to Mariners"no. 61/185, Washington 1884).
N.N. 1898. Den Islandske Lods. Det Kongelige Sökaart-
Archiv, Köbenhavn, 134 bls. Aðrar útgáfur: 1891 (sjá
skrárÓlafs Davíðssonarí Skírni), 1903, 161 bls. 1911,
204 bls. 1917, 208 bls. 1927, 207 bls.
V. Raulin 1866. Quelques vues generales sur les variations
secularies du magnetisme terrestre. Actes de la Société
Linnéenne de Bordeaux, XXVI, 137-228.
Reichs-Marine-Amt 1908. Segelhandbuch fiir die Insel Is-
land. Zweite Auflage, Berlin, 239 bls.
E. Sabine 1872. Contributions to terrestrial magnetism. -
No. XIII. Philos. Trans. RoyalSoc. 162, 353-433.
D.H. Tarling 1989. GeomagneticsecularvariationinBritain
during the last 2000 years. I: Geomagnetism and Pala-
eomagnetism, ritstj. F.J. Lowes o.fl., 55-62. Kluwer
Acad. Publ., Dordrecht.
W. F. Wallis & J.W. Green 1947. Researches ofthe Depart-
ment of Terrestrial Magnetism, vol. VIII: Land and
Ocean Magnetic Observations, 1927-1944. Camegie
Institution ofWashingtonPublication 175, bls. 137,217,
234.
R. Wallut 1884. Observations sur le magnétisme terrestre
en Islande. Revue Maritime et Coloniale 81, no. 272,
387-399.
C.F. Wandel 1879. Bemœrkningertil Beseilingen af Islands
Kyster. C.C. Loses Bog- og Musikhandel, Kpbenhavn,
30bls.
J.F. West (ed.) 1976. Diary of John Baine. The Journals of
the Stanley Expedition to the Faeroe Islands and Iceland
in 1789. Vol. 3. F0royaFróðskaparsetur,Tórshavn, 213
bls.
C. Wille 1882. Magnetiske Observationer, kafli 2 í H. Mohn
& C. Wille: Den Norske Nordhavs-Expedition 1876-
1878. Christiania. Alþýðlegfrásögnumþessaleiðangra
birtist í tímaritinu Vidar 1888, bls. 1-39.
Zeilau, Th. 1861. Fox-expeditionen i Aaret 1860. Fr.
Wpldike, Kpbenhavn, 197+32 bls. og 5 kort.
Zmuda, A.J. (ed.) 1971.WorldMagneticSurvey 1957-1969.
IAGA Bulletin no. 28. IUGG Publications Office, Paris,
206 bls.
Þorsteinn Sæmundsson 1969. LeirvogurMagnetic Observa-
tory 1957-1968. Fjölrituð skýrsla, Raunvísindastofnun
Háskólans, 31 bls. og 5 kort.
Þorsteinn Sæmundsson 1974. Measurements of D and H near
Reykjavík. Leirvogur Magnetic Results 1972. Fjölrituð
skýrsla RH/G/74/B1, 93-97.
Þorsteinn Sæmundsson 1988. Leirvogur Magnetic Results
1987. Raunvísindastofnun Háskólans, fjölrituð skýrsla
RH-17-88, 94 bls.
Þorsteinn Sæmundsson 1990. Leirvogur Magnetic Results
1989. Raunvísindastofnun Háskólans, fjölrituð skýrsla
RH-09-10 94 bls.
Viðbót í prófórk:
Auk ofangreindra heimilda um mælingar P. Löwen-
öms við Island, er þeim lýst stuttlega í Gilberts, Ann.
der Physik, 29, 438-441, 1808.
SUMMARY
MAGNETIC DECLINATION MEASUREMENTS IN
AND AROUND ICELAND
This paper describes various properties of the
present geomagnetic field, including the magnetic
declination which has been used for navigation
purposes for many centuries. Measurements of the
declination were made by various expeditions to Ice-
land since about A.D. 1750 or possibly earlier, but
documentation on their results is scattered, and little
is known of the methods used or their accuracy. Such
measurements turn out to be much more useful when
made at sea than on shore in Iceland, because of the
large disturbing effects of magnetic remanence in local
basalt rock formations.
A list of declination measurements, based on
original compilations by Th. Sigurgeirsson and Th.
Sæmundsson, is provided in the paper. The most
valuable series of observations in the Iceland area
include those of P. Löwenörn in the 1780’s, as well
as French measurements from the period 1830-1900.
The only aeromagnetic survey of Iceland for which
declination values are available, is that of G.W. Haines
et al. in 1965.
It is found that the westerly declination may
have reached a maximum early in the 19th century.
This is also in agreement with global geomagnetic
reconstructions based on historical íield measurements
and archeomagnetism, and may be of use in dating
lavas or artifacts in Iceland. The magnetic inclination
appears to have been fairly constant at 75-77 .
58 JÖKULL,No. 43, 1993