Pellat electrodynamometer, 19th century

Pellat electrodynamometer, 19th century

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Credit: SCIENCE PHOTO LIBRARY

Caption: Pellat electrodynamometer. Historical 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. Artwork from 'Electricite' (1911) by Max de Nansouty, part of the 'Les merveilles de la science' series of 1867-1891 by Louis Figuier.

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Keywords: 1900s, 1907, 20th century, ampere, apparatus, artwork, black-and-white, electric, electric current, electrical, electricite, electricity, electrodynamometer, equipment, european, french, historical, history, illustration, joseph solange henri pellat, jules carpentier, les merveilles de la science, louis figuier, marvels of science, max charles emmanuel champion de nansouty, max de nansouty, measurement, measuring, meter, monochrome, no-one, nobody, pallat balance, physical, physics, precision measurement, si unit, standard unit, standards, technological, technology

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