Manual of Electricity: Including Galvanism, Magnetism, Diamagnetism, Electro-dynamics, Magneto-electricity, and the Electric Telegraph, Volume 10767

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G. Knight and Company, 1857 - Electricity
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Page 864 - ... supposed they only constrained particle-currents to assume a particular direction, which before were in all directions. Weber stands eminent as a profound mathematician who has confirmed Ampere's investigations as far as they proceeded, and who has made an addition to his hypothetical views ; namely, that there is electricity amongst the particles of matter, which is not thrown into the form of a current until the magnetic induction comes upon it, but which then assumes the character of current,...
Page 524 - He observed that the direction of the needle was not to the polar star, but to some fixed and invisible point. The variation, therefore, was not caused by any fallacy in the compass, but by the movement of the north star itself, which, like the other heavenly bodies, had its changes and revolutions, and every day described a circle round the pole.
Page 822 - 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.
Page 794 - ... consists of thirty regular alternations of wood and metal. An extremely light brass spring, which is screwed to a block of ivory or hard wood, and which has no connexion with the metallic parts of the clock, rests by its free end on the circumference of the disc. A copper wire is fastened to the fixed end of the spring, and proceeds to one end of the wire of the electro-magnet ; while another wire attached to the clock- frame is continued until it joins the other end of that of the same electromagnet.
Page 874 - ... of the lines which before were diffused, and not by the addition of the power represented by the lines of force of one pole to that of the lines of force of the other. There is no more power represented by all the lines of force than before, and a line of force is not in itself more powerful because it coalesces with a line of force of another magnet.
Page 532 - The violet light was obtained in the usual manner, by means of a common prism, and was collected into a focus by a lens of sufficient size. The needle was made of soft wire, and was found, upon trial, to possess neither polarity, nor any power of attracting iron filings. It was fixed horizontally upon...
Page 725 - The magnetic needle was then forced back, by pins applied upon opposite sides of its two extremities, to its natural position when uninfluenced by a current ; after which, contact being broken at G or E, it was deflected strongly in the opposite direction ; thus showing, in accordance with the chemical effects...
Page 643 - ... the end b — , and the centre c being crossed by an arrow at right angles to it, directed as in the figure. Through the centre ( and at right angles to the plane \ of the slip of card, there is made to pass a slender stem of wood, at the two ends of which are fixed, in planes parallel to the slip of card AB, the circular discs of card, marked respectively with the letters N and S, and with arrows parallel to, but pointing in a contrary direction to the one at c. The...

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