SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Magnetic field experiment. The spinning top, made from a magnetic material, is shown moving along set lines when close to the poles of a horseshoe magnet. It is following the field lines of the magnet. This illustration, part of a section titled 'Experiences de Physique sans Appareils' (illustrating popular physics experiments that don't require the use of laboratory equipment), is from 'Physique Populaire' (Emile Desbeaux, 1891).
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