Image: Babbage sign language
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Description: w:Charles Babbage, description of a sign language for mechanical components. From On a method of expressing by signs the action of machinery (1827),
Title: Babbage sign language
Credit: http://archive.org/stream/philtrans09445034/09445034#page/n3/mode/2up
Author: Charles Babbage
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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