The Magnetism of Ships And the Mariners Compass Being a Rudimentary Expositio
The Magnetism of Ships And the Mariners Compass Being a Rudimentary Expositio
William Walker
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N. W. And S. S. E. ; but at the Cape, her compass would have errors on these points. Before the ship struck on the rocks off Point Danger, she had been steering a S. S. E. Compass course, as was stated by the surviving helmsman ; and there is ground for our belief, that the officers who perished had placed * See Appendix K. AND THE MARINER S COMPASS. 137 too much confidence in the 8th practical rule for ascer- taining compass deviations ; which states, that the points of no deviation, when once... ascertained, may be regarded as constant. The following Table exhibits the Recruit's Compass Deviations, when upright, and when inclined 8 both ways. Correct Magnetic Courses. Deviations of Compass. Deviations with Iron apparatus applied to partially correct Com- pass, when ship upright. When vessel upright. When vessel 8 to Port. When vessel 8 to Starbd. N. 4. 15 East. 2. 6 East 9. East. 1. West. N. ByE. 11. 15 5. 15 13. 0. N. N. E. 13. 8. 30 19. 30 . 2. 30 East. N. E. By N. 15. 30 10. 15 20. 18 3.
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