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Charles Babbage
Appears to be a sketch based on the National Portrait Gallery photograph NPG Ax18347 by Henri Claudet, 1860s
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http://www.fourmilab.ch/babbage/figures/babbage.jpg
Fourmilab states that "Except for a few clearly-marked exceptions, all the material on this site is in the public domain and may be used in any manner without permission, restriction, attribution, or compensation.".
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