the position assumed during a hoisting operation the up solenoid 75 is powered through a line 91 containing a switch 93 controlled by a time delay unit 88 the operation of the unit 88 is such that when it is energized it immediately closes the switch 93 and when it is deenergized it opens the switch 93 after a 0 5 second time delay when the stop 38 engages the microswitch up limit switch 86 the switch is shifted to the broken line position shown in fig6 therefore it will be understood that if the switch 84 is switched to the 34 up 34 condition when the cable stop 32 engages the boom at that point the switch 86 will be shifted to its broken line or 34 cable up 34 position of fig2 to deenergize the solenoid 75 through the time delay unit 88 and the switch 93 to terminate the upward or pulling in movement of the cable 32 however because of the time delay interval provided by the unit 88 the upward movement of the cable will continue for 0 5 seconds after the switch 86 is operated this assures that the cable stop will be moved into firm engagement with the outer end of the boom and will move it slightly.