[NUMBER 2. VOLUME VII.) centre of the traversing bar, by a bracket, and THE Scientific American, is open at both ends, the bottom one being CIRCULATION 16,000. grooved out to fit loosely over the bar which PUBLISHED WEEKLY … this way the bar with the rack teeth on it, which is moved by H, is traversed outwards in the direction of the arrow, to release the finish- R New Iron Bridge. ed bobbin and receive a new blank piece of A. new iron bridge has lately been con- wood. A projecting bar is fastened to the low- structed…
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