provided with a wheel which runs on or against an annular way on a platform of the crane in connection with wheels attached to a horizontal arm of the mast bele the platform and which wheels run in contact with the under side of tbe mast. the purpose shown and described. forth and for the purposes described. impulse. enameled made in bas-relief around its circumference substantially size and shape of the moldings they are intended to be used upoa ; stantially in the manner and for the purpose set forth., scientific american, 1860-07-21
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