Earth Inductor

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.

Object Name
earth inductor
Hawkins & Wale
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
Place Made
United States: New Jersey, Hoboken
ID Number
accession number
catalog number
Measuring & Mapping
Science & Mathematics
Science & Scientific Instruments
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
U.S. Department of Defense, U.S. Military Academy
Additional Media

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Enter the characters shown in the image.