The Deflection of the Magnetic Needle

1895 ◽  
Vol 39 (1005supp) ◽  
pp. 16070-16070
Keyword(s):  
Magnetic Needle

scholarly journals Report of magnetic experiments tried on board an iron steam-vessel, by order of the Right Hon. the Lords Commissioners of the Admiralty

1837 ◽  
Vol 3 ◽  
pp. 378-380
Keyword(s):  
Malleable Iron ◽  
The Right ◽  
The City ◽  
Magnetic Needle

This report commences with a description of the iron steam-vessel, the “Garryowen,” belonging to the City of Dublin Steam Packet Company, and built by the Messrs. Laird, of Liverpool. She is constructed of malleable iron, is 281 tons burthen, and draws only 5 1/4 feet water, although the weight of iron in the hull, machinery, &c. is 180 tons. This vessel was placed under the directions of the author, in Tarbert Bay, on the Shannon, on the 19th of October, 1835, for the purpose of investigating its local attractions on the compass. The methods which were adopted with that view are given ; together with tables of the results of the several experiments, and plans of the various parts of the Garryowen. The horizontal deflections of the magnetic needle at different situations in the vessel were observed, for the purpose of ascertaining the most advantageous place for a steering compass, and also for the application of Professor Barlow’s correcting plate : and the dip and intensity in these situations were, at the same time, noted.

scholarly journals On irregularities observed in the direction of the compass needles of H. M. S. Isabella and Alexander, in their late voyage of discovery, and caused by the attraction of the iron contained in the ships

1833 ◽  
Vol 2 ◽  
pp. 109-109
Keyword(s):  
Magnetic Meridian ◽  
Magnetic Needle ◽  
Made In

In this paper Captain Sabine shows in what respect the effects of local attraction in the above-mentioned ships were conformable to observations made in previous voyages; and how far the errors found to take place on different courses, and under different dips of the magnetic needle, corresponded with those rules for calculating corrections recommended by Captain Flinders, who found that in every ship a compass would differ very materially from itself on being removed from one place to another, and this was found to be the case in the Isabella and Alexander. As the ships ascended Davis’s Straits, the binnacle compasses, in consequence of their construction, became nearly useless; accordingly, a standard compass was placed in the Isabella exactly amidship between the main and mizen mast, on a stout cross-beam, about nine feet above the deck; and in the Alexander amidship, on a box of sand five or six feet above deck. Captain Sabine next describes the methods by which the points of no error in these compasses were determined, and which were not in either ship coincident with the magnetic meridian.

Magnetic needle rheometer

1989 ◽  
Vol 60 (9) ◽  
pp. 3047-3050 ◽  
Author(s):  
Benjamin Chu ◽  
Rolf Hilfiker
Keyword(s):  
Magnetic Needle

Experiments on the influence of the aurora borealis on the magnetic needle. By the Rev. James Farquharson, F. R. S. Minister of Al­ford, Aberdeenshire. In letters addressed to Captain Edward Sa­bine, Sec. R. S

1833 ◽  
Vol 2 ◽  
pp. 391-392
Keyword(s):  
Royal Society ◽  
Magnetic Intensity ◽  
Aurora Borealis ◽  
Magnetic Declination ◽  
Stop Watch ◽  
The Mind ◽  
Magnetic Needle

In the first letter, dated from Alford, Dec. 15, 1829, the author gives a description of the instrument which was furnished to him by the Royal Society for measuring the variation of the magnetic needle, and also the magnetic intensity; and of his mode of using it. The needle was so delicately suspended as to render changes in the declination as small as 10'´ very sensible. In his experiments on the magnetic intensity, the intervals of time occupied in the needle’s performing 50 oscillations, commencing with an arc of 12°, were noted by a stop-watch, in which the stop, being applied on the ba­lance, is instantaneous in its operation. The watch is again released from the stop at the commencement of a new observation; thus com­pensating, on the principle of the repeating circle, for any inaccuracy in the reading off, or any inequality in the divisions of the dialplate. The observations made on an Aurora borealis which appeared on the night of the 14th of December, are particularly detailed. On that occasion, the disturbance of the magnetic declination was so great, and so frequently changing from east to west, and the reverse, as to leave no doubt in the mind of the author of the reality of this influence. The needle, however, was affected at those times only when the fringes of the aurora were in such a position as to include the needle in their planes. It appeared to him, also, that the side towards which the needle declined, was the quarter where the aurora gave out the most vivid light.

scholarly journals XXV. A letter from Mr. William Mountayne, F. R. S. to the Right Honourable James Earl of Morton, President of the Royal Society, containing some observations on the variation of the magnetic needle, made on board the Montagu Man of War, in the years 1760, 1761, and 1762, by Mr. David Ross, Surgeon

1766 ◽  
Vol 56 ◽  
pp. 216-223 ◽  
Keyword(s):  
Atlantic Ocean ◽  
Royal Society ◽  
The Earth ◽  
The Right ◽  
Magnetic Needle

My Lord, The following tables I have compared with the variation chart, published in the year 1756, and so find that they agree pretty well in general, making allowance for the time elapsed: it is true, that, in some few places in the Atlantic Ocean, they differ; yet this may probably arise, as is often the case, from an error in the Montagu's supposed longitude, where such observations were made. But the greatest difference (a greater than should arise, I think, according to common course) appears upon the coast of Portugal, Cape Saint Vincent, and about Gibraltar, near and within sight of land, where the observations are ascertained to the spot. Hence, if mine observed about the year 1756, and those of Mr. Ross's, were both near the truth, at the respective times when they were taken, I know not how to account for this considerable encrease, unless those late extraordinary convulsions, in the bowels of the earth, upon those several coasts, may be found, by further experiments, to have there influenced the directions of the magnetic needle.

scholarly journals III. Magnetical experiments and observations

1787 ◽  
Vol 77 ◽  
pp. 6-25
Keyword(s):  
Royal Society ◽  
Magnetic Needle

The Bakerian Lecture, which last year I had the honour to deliver to the Royal Society, contained the account of some magnetical experiments, particularly concerning the magnetism of brass, from which it appeared, that most brass becomes magnetic, so far as to attract the magnetic needle, by being hammered, and loses its magnetism by annealing or softening in the fire; but that there is some brass, which possesses no magnetism naturally, not acquires any by hammering.

The Electrical Telegraph

2021 ◽  
pp. 47-94
Author(s):  
Laszlo Solymar
Keyword(s):  
Electric Current ◽  
Historical Context ◽  
Armed Forces ◽  
Women's Employment ◽  
First Line ◽  
Russian Government ◽  
Women’S Employment ◽  
Ordinary Life ◽  
Magnetic Needle

Many attempts at realizing an electric telegraph are discussed starting in the 18th century. The crucial discovery that gave renewed impetus to the search was that of Oersted’s concerning the effect of electric current upon a magnetic needle. The first line in England was installed between Paddington and West Drayton. The contributions of various inventors like Gauss, Weber, Shilling, Cooke, and Wheatstone are discussed; also the effect on diplomacy, war and ordinary life, including women’s employment, is examined. Some famous telegrams, e.g. Ems, Kruger, Zimmerman, are put into their historical context, so is the telegraphic contact between Kerensky (Head of the Provisional Russian government at the time) and Kornilov, Commander of the Armed Forces.

Simile of the soul and magnetic needle

1852 ◽  
Vol s1-VI (163) ◽  
pp. 566-566
Author(s):  
M. L.
Keyword(s):  
Magnetic Needle
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