Document k6MjV2eEoJxOgGnwBRBavzQ0

SHACKLE, GUY ROPE . GUDGEON -COLLAR AND BOLT -SPIDER PLATE STRAP BLOCK BOOM BAND STRAP BLOCK -BOOM PLATE FOOT BLOCK PIN IN BOOM SEAT BOOM FALL MAST STEP ' FOOT BLOCK IRON `MAST STEP SHEAVE PIN 'FOOT BLOCK TIMBERS FALL LINE Fic 25-15 --Diagram of guy derrick (For simplicity, only one guy is shown ) Courtesy Travelers Insurance Co the new erection floor, the boom is raised and again connected at the hinge To swing guy derricks, the men push either on the suspended load or on a pipe "bull stick" attached near the base of the mast Other types of derricks are the gin pole and the breast derrick The gin pole is merely a mast slightly out of plumb, with a hoisting tackle suspended from its upper end The gin pole is supported by a number of 685