Detail of babbage style difference engine cams, Little Dorrit 1855

This is a scan from an original 1855 installment of Charles Dickens's _Little Dorrit.

This detail is enlarged to show the cams which are identical to those built for the Difference engine copies, In the London Science museum, and Private collections.
posted by Arethusa on Tuesday, June 9, 2009 - link to this photo
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