- Taschenbuch: 86 Seiten
- Verlag: Cambridge Scholars Publishing (23. Dezember 2009)
- Sprache: Englisch
- ISBN-10: 115141493X
- ISBN-13: 978-1151414939
- Größe und/oder Gewicht: 15,2 x 22,9 x 0,5 cm
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1820. Excerpt: ... of the dipping needle, which that author supposes to be guided by the earth's magnetism. Instead of this, may we not rather consider them as constituting the great directive agent, and that they give rise to those magnetic phenomena hitherto attributed to the earth's magnetism, instead of being guided by it? This view of the subject would be very consistent with the ideas of Mr. Christie, as given in the commencement of this section. I shall here conclude my observations on this subject, but shall add, for the convenience of the reader, the memoir to which I have more than once referred in the preceding pages, viz. that presented by Captain Sabine to the Royal Society, and printed in the Philosophical Transactions for 1819 APPENPIX; Containing Captain SaBine's Observations on the Isabella's Compass in the late Voyage of Discovery. It is proposed in this paper to show in what respects the effects of local attraction, in the above-mentioned ships, were conformable to the observations which had been made in preceding voyages; and how far the errors, which were found to take place on different courses, and under different dips of the magnetic needle, corresponded with the rules for calculating corrections, which Captain Flinders had found useful in his own experience, and which he had recommended for a more extensive trial. It may be desirable to premise, that the irregularities here alluded to, are not those accidental disturbances which may be caused by iron placed inadvertently too near the compasses; but the permanent and constant effect of the mass of iron contained in a ship, affecting its compasses at all times, and in a greater or less degree, according as its influence is more or less powerful, in comparison to the directive force of the earth's magn...
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