Model of Faraday's Dynamo of 1831

Description (Brief):

No extant maker's markings. A copper disc is mounted so that it can be rotated between the poles of a stack of three permanent horseshoe magnets. A copper brush rubs against the edge of the disc, which is cranked with a white celluloid handle. This entire direct current generator unit was mounted on a rectangular wooden frame which contains an AC motor used to spin the copper disc for exhibit purposes. Appropriate reduction takes place through hidden gears behind the disc. Output voltage terminals for the dynamo are available on the wooden base. This unit "was made in the shop of the Divisions of Mineral and Mechanical Technology in 1930 by Fred C. Reed and Roderick Davis, from drawings made by Fred C. Reed after a half-tone illustration on page 16 of The History of the Incandescent Lamp by John W. Howell and Henry Schroeder, Schenectady, 1927." Reference: Audel's New Electric Library Vol. 1, pages 198-200.

Date Made: 1930

Associated Person: Faraday, MichaelMaker: Reed, Fred C.

Location: Currently not on view

See more items in: Work and Industry: Electricity


Exhibition Location:

Credit Line: Made in the Museum

Data Source: National Museum of American History

Id Number: EM.309824Catalog Number: 309824Accession Number: 109553

Object Name: Dynamoelectrical generatorOther Terms: Dynamo; Magnetic Devices; Electromagnetic Devices; Electromagnetic Devices

Measurements: overall: 9 1/2 in x 14 in x 10 in; 24.13 cm x 35.56 cm x 25.4 cm


Record Id: nmah_709848

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.