File:EB9 Sir William Thomson's Compass-card.png

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Summary

Description
English: Fig. 2.—Plan and Transverse Section of Sir William Thomson's Compass-card.
Date
Source https://en.wikisource.org/wiki/Page:Encyclop%C3%A6dia_Britannica,_Ninth_Edition,_v._6.djvu/256
Author Encyclopædia Britannica, 9th ed., Vol. VI

Licensing

Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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