. Construction : a journal for the architectural engineering and contracting interests of Canada . ing after the girderswere in position. The derrick was run back to thematerial yard and one of the gilders was loaded on lift is not taken in anything heavier than a lightbreeze, otherwise the girder could not be controlledand might easily upset the car. By referring to the illustration it will be seen thattwo balance beams are used. These are made to beinterchangeable for convenience in assembling. Theupper one is at right angles to the track and its endsare connected by shackles to the blocks o
. Construction : a journal for the architectural engineering and contracting interests of Canada . ing after the girderswere in position. The derrick was run back to thematerial yard and one of the gilders was loaded on lift is not taken in anything heavier than a lightbreeze, otherwise the girder could not be controlledand might easily upset the car. By referring to the illustration it will be seen thattwo balance beams are used. These are made to beinterchangeable for convenience in assembling. Theupper one is at right angles to the track and its endsare connected by shackles to the blocks on the loadlines. This beam serves to distribute the load equallybetween the booms. The lower beam is just above the girder andparallel to it. At each end is a shackle which carriestwo double hooks which, in turn, catch the underside of the top flange of the girder. In all, the girderIS lifted at eight different points over a length of aboutfour feet, and by so lifting no undue strain comes onany of the rivets in the flange. A pin at the centreof each beam connects to an intermediate togle, and. ==t^i. -UP-KXI)IXG A DENT BY MEANS OK DERRICK CAR. a pair of buggies after the manner of handling girderswhen unloading The loading frames used in shipping girders, andeach consisting of a timber sill and a timber brace oneach side of the girder leading from the outer end ofthe sill to the under side of the top flange of thegirder and all properly bolted, are used to steady thegirders on the buggies. As soon as the girder isloaded on the buggies it is pushed out by the derrickcar to the end of the track and the load lines of thederrick car fastened to the centre of the top flangeof the girder by means of heavy grab hooks. Thetackle is so arranged by means of balance beams thatthe load is equally distributed between the two boomsand its position is readily controlled. Care mustalways be used to see that the load is in line with thecentres of the two trucks under the car and that a as thes
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