50.0 MB (5.7 MB compressed)
3654 x 4784 pixels
31.0 x 40.4 cm ⏐ 12.2 x 15.9 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Magnetism experiment. 19th-century illustration of an artificial magnet being prepared by stretching an iron wire. Magnetism can be induced in soft ferromagnetic materials by processes such as stretching, annealing and hardening. The resulting magnet is shown placed in glass of water, where it will align with the Earth's magnetic field, reproducing the behaviour seen in a compass needle. 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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