Magnets and Magnetism Simply Explained

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Spon & Chamberlain, 1910 - Magnetism - 90 pages
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Page 6 - ... centre. These hands are the needles which are the tongues of the apparatus ; in their vibrations to the right and left, their starts and pauses, the whole correspondence is conveyed. For each needle visible on the face of the instrument there is a corresponding one inside, the two being so placed that the north pole of the one and the south pole of the other are in the same position, so as to neutralise their magnetism, or rather the action of magnetism upon them. They are thus kept in a perpendicular...
Page 66 - No. i, and the plunger will be partly withdrawn by the pull of the spring. It is thus possible to regulate the position of the plunger according to the amount of current flowing in the respective coils.

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