Pellat electrodynamometer. 19th-century illustration of the electrodynamometer devised in the 19th century by French physicist Joseph Solange Henri Pe

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Pellat electrodynamometer. 19th-century illustration of the electrodynamometer devised in the 19th century by French physicist Joseph Solange Henri Pellat (1850-1909). This device was capable of making extremely accurate measurements of electric currents. Standard masses are placed on the balance pan (right) to allow precision measurement of the international standard for the ampere, the unit of electric current. The Pellat method remained the standard way to measure the ampere for many years. This model is by French engineer Jules Carpentier. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891).

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Size: 5131px × 3406px
Photo credit: © Science Photo Library / Alamy / Afripics
License: Licensed
Model Released: No

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