The above aim is achieved by means of a device that comprises an arm consisting of a number of consecutive segments fixed with one of its ends, to {HEAD ~ a first pivot} protruding from a structure and made revolving so to bring about the oscillation of {TAIL ~ the arm} 
The above aim is achieved by means of a device that comprises an arm consisting of a number of consecutive segments fixed with one of its ends , to { HEAD ~ a first pivot } protruding from a structure and made revolving so to bring about the oscillation of { TAIL ~ the arm }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL