Gin pole

A gin pole is a rigid pole with a pulley or Block and tackle on the end used for the purpose of lifting. The lower portion of the gin-pole is set in a shallow hole in the ground and the top secured with three or more guy-wires. The wires or ropes can be manipulated to position the object being lifted. or attached to the upper exterior of an existing tower or structure. The gin-pole's free end extends above the location the object is to be lifted. When used to create a segmented tower or antenna, the gin-pole can be detached, raised and re-attached to the just completed segment for the purpose of lifting the next segment. The process is repeated until the top most portion of the tower is completed.
 
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