Image:Gramme dynamo.png

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[edit] Summary

Description

Woodcut of Gramme dynamo, an electrical generator designed by Belgian inventor Zénobe Gramme in 1871. It was the first machine to be used industrially to generate power. His innovation was to use many armature windings (30 in this machine), wound on a doughnut shaped armature, and switched with a many segmented commutator, to smooth the output waveform, producing nearly constant DC power. This shows a hand cranked model from the 1870s used widely in laboratories, text says it's output was equivalent to "eight ordinary Bunsen elements [batteries]". It used laminated permanent magnets invented by Jamin.
Source

Downloaded 2007-12-21 from Hippolyte Fontaine (1878) Electric Lighting: A Practical Treatise, translated from French by Paget Higgs, E. & F.N. Spon, London, UK, p.86, fig.30 on Google Books. The drawing is signed 'Perot'.
Date

1878
Author

Hippolyte Fontaine
Permission
(Reusing this image)

Public domain - Fontaine died 1917

[edit] Licensing

Public domain This image (or other media file) is in the public domain because its copyright has expired.

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Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Côte d'Ivoire has a general copyright term of 99 years and Honduras has 75 years, but they do implement that rule of the shorter term.

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File history

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Date/TimeDimensionsUserComment
current18:18, 27 January 2008658×656 (81 KB)Chetvorno ({{Information |Description=Woodcut of Gramme Wikipedia:dynamo, designed by Zénobe Gramme around 1870. This is a model designed for use in laboratories. |Source=Downloaded 2007-12-21 from [http://books.google.com/books?id=c64OAAAAYAAJ&pg=PA86 Hipp)
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