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Scientific American, Vol. 7, No. 41 (June 1852) (1852)

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An illustration from Scientific American, Vol. 7, No. 41 (June 1852), 1852, leaf 0
esired point by the set screw, h. On between the scores in the frogs and the guard each of these parts, /and g, there is a zig-zag rails is an inch or more greater than the dis- projection. The space between these projec- tance between the, wheels which pass them; tions, therefore, is of a zig-zag… … rests upon the levers, M M. the twenty minutes the animal was insensible. © 1852 SCIENTIFIC AMERICAN, INC

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