to which the main cable 136 is hooked initially the boom 114 is inclined at approximately 45 degrees both the jib cable 118 and the main cable 136 are taken up simultaneously to lift the working bin 10 off the ground in a horizontal attitude to a height of approximately ten feet above the ground the hoisted bin is then rotated to a vertical attitude by keeping the main cable 136 fixed while taking up the jib cable 118 and raising the jib 116 as the working bin is brought to a vertical attitude the jib cable 118 supports an ever increasing fraction of the weight of the working bin until when the bin has been rotated to a vertical attitude the entire weight is carried by the jib cable 118 and the main cable 136 is unhooked from the choker cable 132 rotation of the working bin to the vertical attitude above the ground is preferable to simply tilting it to a vertical attitude while leaving its lower end 130 on the ground because in the latter method the weight of the bin is rested on its lower edge which bears against the ground and as the bin is rotated the connectors will be damaged in the preferred embodiment of the method rotation of the bin to a vertical attitude is accomplished with the entire bin supported above the ground after the bin has been rotated to the vertical attitude it is positioned by use of a crane 112 to a position directly above one of the hexagons formed by the struts 58 and with the corners of the bin.