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C. Wille. Magnetiske Observationer.
Efter den for Nordhavs-Expeditionen lagte Plan skulde
der søges udfort Observationer til Bestemmelse af
Jordmagnetismens Elementer saavel i Land som i Søen. Til
dette Øjemed anskaffedes og medbragtes følgende
Instrumenter :
Et Unifilar-Magnetometer. No. 38, af Elliott Brothers
i London. Instrumentet blev verificeret og dets Konstanter
bestemte ved Observatoriet i Kew.
En liden Theodolit af Olsen i Kristiania, laant af
den geografiske Opmaaling.
Et Inklinatorium af John Dover, Charlton. Kent,
undersøgt i Kew.
Et Admiralitets-Standard-Kompas, verificeret ved
Kompas-Observatoriet i Deptford.
Flere Azimuth-Kompasser.
’ En Fox-Cirkel No. 30 af John Dover, med
Hjælpeapparater og Slingrebord.
Flere Kronometre og Sextanter.
Et Observationstelt fra Bergens Arsenal, velvillig
ud-laant af Armé-Intendanten.
Jeg skal nu særskilt behandle Observationerne . paa
Landstationer og Observationerne i Søen.
C. Wille. Magnetical Observations.
The Scheme of Work approved for the Norwegian
North-Atlantic Expedition, was, if possible, to comprise
observations for determining the elements of terrestrial magnetism,
alike on shore and at sea. With this object in view, the
following instruments were provided.
A Unifilar Magnetometer. No. 38. made by Elliott
Brothers, of London. This instrument was verified, and
had its constants determined, at the Kew Observatory.
A small Theodolite, by Olsen of Christiania, obtained
on loan from the Geographical Survey.
A Dip-Circle, by John Dover, of Charlton. Kent,
examined at Kew.
An Admiralty Standard-Compass, verified at the
Compass Observatory, Deptford.
Several Azimuth-Compasses.
A Fox-Circle. No. 30. by John Dover, with auxiliary
apparatus and gimbal-table.
Several Chronometers and Sextants.
A Tent, kindly lent from the Bergen Arsenal.
I will now pass on to the observations, describing
separately those taken at the land-stations and those made
at sea.
A. Observationer paa Land-Stationer
og deres Resultater.
a. Deklination.
Begge til Magnetometret hørende Magneter var
Kollimations-Magneter. meel Skalaer i Objectivglassets Brændplan.
Da Instrumentet ikke var forsynet meel Plan-Spejl til
De-klinationsbestemmelse, men kun havde et Hulspejl til at
A. Observations at Land-Stations,
and their Results.
a. Declination.
Both of the magnets belonging to the magnetometer
were collimator-magnets, with the scale in the focal plane
of the object-glass. The instrument not being provided
with a plane mirror for observing the declination, but
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