Earth Inductor

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James W. Queen & Co. termed this instrument an "Induction Apparatus. To show the induction arising from the action of the earth." The form was introduced by Charles Delezenne in Lille, France, in 1844, and often referred to as "Delezenne's circle." This example is marked "HAWKINS & WALE MAKERS STEVENS INSTITUTE HOBOKEN, N.J.' It belonged to the U.S. Military Academy at West Point and dates from the early 1870s when Hawkins & Wale had a workshop on the campus of the Stevens Institute of Technology.

Ref: James W. Queen & Co., Priced and Illustrated Catalogue of Physical Instruments (Philadelphia, 1888), p. 106.

Charles Delezenne, "Notions élémentaire sur les phénoménes d'induction," Mémoires de la Societé; des Sciences de Lille 23 (1844): 1-132, on 109-120.

Adolphe Ganot, Elementary Treatise on Physics (London, 1867), pp. 701-702.

Currently not on view
Hawkins & Wale
Place Made
United States: New Jersey, Hoboken
Physical Description
wood (overall material)
base: 29 in x 29 in; 73.66 cm x 73.66 cm
overall: 27 1/2 in; 69.85 cm
overall: 16 in x 29 in x 29 in; 40.64 cm x 73.66 cm x 73.66 cm
ID Number
accession number
catalog number
Credit Line
U.S. Department of Defense, U.S. Military Academy
Science & Scientific Instruments
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Science & Mathematics
Data Source
National Museum of American History


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