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http://s3.amazonaws.com/omeka-net/2253/archive/files/d94d78df3643c79ac43e3b47ca786ab6.JPG
This early relative of the slide rule has a cylinder 4 in. in diameter and 18 in. long that rotates and slides in and out between the array of twenty equally-spaced parallel bars. The bars have a scale with numbers spaced logarithmically, as on a…
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