Rudimentary Magnetism: Being a Concise Exposition of the General Principles of Magnetical Science and the Purposes to which it Has Been Applied, Томи 1 – 2John Weale, 1850 - 159 стор. |
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agate annexed Fig attraction axis azimuth bodies brass Brook Taylor centre circle coil compass compound magnet considered Coulombe curve cylinder deflected degrees determined deviation diameter dipping needle distances inversely earth east electrical electrical currents electro-magnetic employed experiment extremity fixed fluid given hence horizontal needle inches in length inclination induction instrument intensity isoclinal lines isogonal lines law of magnetic lodestone magnetic bar magnetic condition magnetic force magnetic meridian magnetic needle magnetic poles magnetometer magnetoscope mass metallic method motion moveable netic north pole obliquity observed obtain opposite poles oscillation Paramagnetic particles phenomena placed plane polarity position Professor Barlow quantity ratio reciprocal represented repulsive result right angles ROTATORY MAGNETISM ship ship's head similar soft iron south pole steel substance suppose surface suspended termed terrestrial magnetic thick tion torsion true meridian turned variation vertical vibrations Voltaic whilst wire zinc
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Сторінка 135 - Psalms, which has been referred to the end of the thirteenth or the beginning of the fourteenth century.
Сторінка 55 - But whether elastic fluids do really consist of particles so repelling each other, is a physical question. We have here demonstrated mathematically the property of fluids consisting of particles of this kind, that hence philosophers may take occasion to discuss that question.
Сторінка 102 - Ross ; and he remarks, that the very spot where this officer found the needle perpendicular, "that is, the pole itself, is precisely that point in my globe and chart in which, by supposing all the lines to meet, the several curves would best preserve their unity of character, both separately and conjointly as a system.
Сторінка 72 - ... has thus been rendered visible, revolution of the eye-piece to the right or left, more or less, will cause its extinction ; and the further motion of the eye-piece to the one side or Other of this position will produce the reappearance of the light, and that with complementary tints, according as this further motion is to the right or left hand.
Сторінка 161 - variations observed with the ship's head in different positions, and even in different parts of her, will materially differ from one another, and much more will observations observed on board different ships.
Сторінка 59 - ... effect of a ring of copper upon the oscillation of a delicate magnetic needle which it enclosed. In free space the magnet performed 420 oscillations before it reached an arc of 10°, whereas, when surrounded with a copper ring, they were reduced to fourteen oscillations ; under the same circumstances in a ring of wood, the oscillations were reduced from 420 to about 300.
Сторінка 51 - The kind of polarity given to steel or iron thus circumstanced will, as may be inferred (46), depend on the direction of the current with reference to the axis of the helix, and this again will depend on the connections with the plates of the voltaic circle and the direction in which the helix is turned. Now, the spiral may evidently be turned either direct, as in the threads of a corns...
Сторінка 11 - The power of gravity is of a different nature from the power of magnetism; for the magnetic attraction is not as the matter attracted. Some bodies are attracted more by the magnet; others less; most bodies not at all. The power of magnetism in one and the same body may be increased and diminished; and is sometimes far stronger, for the quantity of matter, than the power of gravity; and in receding from the magnet decreases not as the square but almost as the cube of the distance, as nearly as I could...
Сторінка 114 - D, moveable between guide-pieces, and acted on through a nut at q by a vertical screw p q, about 6 inches in length and f ths of an inch in diameter; so that the whole may be raised or depressed, and hence the suspended cylinder and magnet placed at any required distance apart. The regulation of this important element in the operation of magnetic forces is hence provided for in two ways, viz. by the rack at G and the milled head at p, either of which may be employed, as found most convenient. The...