bottom of the base in tension, and when tbe weight is removed the rest is lifted. having their lower ends connected by chains to the lower ends plate. Fitted in bearings in the cross pieces and in the nut As a motor is fastened to each foot, it is only necessary to of the sliding bars. Chains,… … Plans for a Nenr Harlem River Bridge. HALL'S GBAVIUOTOB. QVABNSTBOM'S IMFBOVED LIFTING JACK. Three plans for a new bridge over the Harlem River at One hundred and eighty-first Street, this city, have been laid motor may be constructed with two driving wheels forward, hoisting screw and the center…
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