Spinning Tops: the "operatives' Lecture" of the British Association Meeting ...
Spinning Tops: the "operatives' Lecture" of the British Association Meeting ...
John Perry
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If I turn its ^ Sir William Thomson has performed this. Fig. 49. Hosted by Google SPINNING TOPS. Til frame so that it can only move at right angles to the meridian, you see that it points vertically. You may reflect upon the analogous properties of this magnetic needle (Fig. 50) and of the ' gyrostat (Fig. 47); they both, when only cap- able of moving hori- zontally, point to the north ; and you see that a very frictionless gyrostat might be used as a compass, or at all events as a corrector of... compasses.^ I have just put before you another analogy, and I want you to understand that, although these are only analogies, they are not mere chance analogies, for there is undoubtedly a dynamical connection between the magnetic and the gyrostatic phenomena. Magnetism depends oh rotatory motion. The molecules of matter are in actual rotation, and a certain allineation of the axes of the rotations produces what we call magnetism. In a steel bar not magnetized the little axes of rotation are all in different directions.
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