Coacting boom structure

Claim 1

COACTING BOOM STRUCTURES COMPRISING A TELESCOPING BOOM HAVING A FIXED BOOM SECTION AND A MOVABLE BOOM SECTION SLIDABLY MOUNTED IN SAID FIXED SECTION FOR MOVEMENT LONGITUDINALLY RETRACTED INTO AND EXTENDED OUT OF SAID FIXED SECTION, MEANS FOR RETRACTING AND EXTENDING SAID BOOM, A RIGID BOOM HAVING AN END PIVOT CONNECTION AND AN INTERMEDIATE PIVOT CONNECTION INTERMEDIATE THE ENDS OF SAID RIGID BOOM AND SPACED A PREDETERMINED DISTANCE FROM SAID END PIVOT CONNECTION, A RIGID STRUT SHORTER THAN SAID TELESCOPING BOOM, EXTENDED AND HAVING END PIVOT CONNECTIONS AT ITS OPPOSITE ENDS, PIVOT MOUNTING FIXED RELATIVE TO SAID FIXED BOOM SECTION, A PIVOT MOUNTING ON SAID MOVABLE BOOM SECTION, ONE END PIVOT CONNECTION OF SAID STRUT ADAPTED TO PIVOTALLY COACT WITH SAID RIGID BOOM INTERMEDIATE PIVOT CONNECTION, AND SAID RIGID BOOM END PIVOT CONNECTION AND THE OTHER OF SAID STRUT END PIVOT CONNECTION BEING INTECHANGEABLY CONNECTABLE TO EITHER OF SAID PIVOT MOUNTINGS, WHEREBY, WITH SAID RIGID BOOM END PIVOT CONNECTION PIVOTALLY CONNECTED TO EITHER ONE OF SAID PIVOT MOUNTINGS AND THE OTHER OF SAID STRUT END PIVOT CONNECTIONS, PIVOTALLY CONNECTED TO THE OTHER OF SAID PIVOT MOUNTINGS, RETRACTION AND EXTENSION OF SAID TELESCOPING BOOM WILL CAUSE OSCILLATION OF SAID RIGID BOOM ABOUT ITS END PIVOT CONNECTION.