Elementary Treatise on Natural Philosophy, Volumen3Blackie, 1881 |
Términos y frases comunes
acid action angle apparatus armature arrangement attraction axis ball battery bismuth called carbon cells centimetres centre charge circuit condensing conductor connected consists copper copper wire cylinder deflection denote diamagnetic difference of potential diminished disc discharge distance earth effect elec electrical machine electrified electro-magnet electro-motive force electrode electrolysis electroscope employed equal experiment galvanometer glass gutta percha heat Hence horizontal increase induced currents inner coating instrument insulated intensity inversely junction knob length Leyden jar lines of force magnetic force magnetic meridian metal millimetre motion movable nearly needle observed obtained opposite direction outer coating parallel passes pendulum perpendicular pith-ball plane poles portion positive electricity produced quantity of electricity repelled represented in Fig repulsion resistance revolving rotation round shellac side soft iron solenoid spark surface suspended telegraph temperature terrestrial magnetism tion tricity tubes of force unit velocity vertical wire zero zinc
Pasajes populares
Página 568 - I went into the cube and lived in it, and using lighted candles, electrometers, and all other tests of electrical states, I could not find the least influence upon them, or indication of anything particular given by them, though all the time the outside of the cube was powerfully charged, and large sparks and brushes were darting off from every part of its outer surface.
Página 676 - Unlike sea water, brackish waters differ in quality, quantity, and composition not only from place to place, but also from time to time even at a given location.
Página 689 - The copper of the first cup is connected with the zinc of the second, the copper of the second with the zinc of the third, and so to the end of the series.
Página 686 - Tyndall accordingly concludes that " if the arrangement of the component particles of any body be such as to present different degrees of proximity in different directions, then the line of closest proximity, other circumstances being equal, will be that chosen by the respective forces for the exhibition of their greatest energy. If the mass be [para] magnetic, this line will stand axial; if diamagnetic, equatorial."2 1 Tyndall on Diamagnetism, p.
Página 846 - If the current becomes too strong, o is stopped, o is released, and the carbons are drawn back. When the anchor Tt is exactly vertical, both flies are arrested, and the carbons remain stationary. The curvature of the lever on which the spring acts being very slight, the oscillations of the armature and anchor are small, and very slight changes in the strength of the current and brilliancy of the light are immediately corrected.
Página 647 - ... surface, this part of its surface will quickly be reduced to a state of no electrification, and the whole conductor will be brought to such a potential as will allow it to remain in electrical equilibrium in the air, with that portion of its surface neutral. In other words, the potential throughout the insulated conductor is brought to be the same as that of the particular equi-potential surface in the air, which passes through the point of it from which matter breaks away. A flame, or the heated...
Página 842 - Fig. 510 represents the image thus obtained, the natural size of the carbons being indicated by the sketch at the right hand. On watching the image for some time, incandescent particles will be observed traversing the length of the arc, sometimes in one direction and sometimes in the other, the prevailing direction being, however, that of the positive current. This circumstance, which appears to be connected with the higher temperature of the positive terminal, explains the difference between the...
Página 671 - Observations of magnetic force are made either by counting the number of vibrations executed in a given time, or by statical measurements. If a magnet executes small horizontal vibrations under the influence of the earth's magnetism, the square of the number...
Página 612 - Leyden jar. The Leyden jar, it may be remembered, consists of a glass jar, coated both inside and out with tin foil for about four-fifths of its height. The mouth is closed by a cork, through which passes a metallic rod, terminating above in a knob and connected below with the inner coating, usually by a chain depending from it.
Página 653 - This draws down the strata of cold air above, which, coming in contact with the warm and moist atmosphere ascending in the middle of the tornado, condenses the vapor and forms the funnel-shaped cloud. As the gyratory motion becomes more violent, it gradually overcomes the resistances nearer the surface of the sea, and the vertex of the funnel-shaped cloud gradually descends lower, and the imperfect vacuum of the centre of the tornado reaches the sea, up which the water has a tendency to ascend to...