A New Theory of Terrestrial Magnetism Read Before the New York Lyceum of Natur
A New Theory of Terrestrial Magnetism Read Before the New York Lyceum of Natur
Samuel Lytler Metcalfe
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50. ) I placed a dozen fine sewing needles on water in succes- sion, all of which polarized, but some more speedily than others. When rubbed between two metals, until warm to the touch, they traversed briskly, and settled very soon in the di- rection of the magnetic meridian. Soon after communicating our views of the connection between caloric and magnetism to a gentleman of this city, he submitted the blade of his pen- knife to friction on the face of a smoothing iron, with a com- mon poker wh...en it became strongly magnetic. We have performed the experiment in various ways, and always with the same result. Great irregularities in the time of chrono- meters have often resulted from the balance wheel becoming magnetic. Captain Scoresby has suggested a mode of recti- fying the 'errors of chronometers by suspending them in such a way that they will always keep in the same position at sea, with respect to the magnetic meridian. (See Edinburgh Philosophical Journal, Vol. IX. , p. 54. ) 139.
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