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Heeling and Pitching Error Correction without local Readjustment

Published online by Cambridge University Press:  18 January 2010

T. H. O'Beirne
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Extract

This paper first gives a brief account of the deviation theory applicable to magnetic compasses and a unified theoretical treatment of the principal heeling-error and pitching-error effects. Consequences of symmetry in soft-iron correctors are then considered, and a system of six equal soft-iron spheres at equal distances along three mutually perpendicular axes is shown to have no effect at the compass position, any diametral pair thus having a complete negative counterpart in the remaining four.

This leads to the deduction of the possibility of a simple form of corrector system in which soft-iron correctors remove those parts of the principal inclination errors which are due to induced magnetism. If the remaining part due to permanent magnetism is assumed to be removed by vertical magnets in the usual manner, the correctors when once adjusted would then require no readjustment on change of locality, in distinction from all known correctors at present in use or in course of manufacture, which require continual readjustment in these conditions.

Type
Research Article
Information
The Journal of Navigation , Volume 2 , Issue 4 , October 1949 , pp. 324 - 337
Copyright
Copyright © The Royal Institute of Navigation 1949

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