{TAIL ~ Apparatus} 1, wherein {HEAD ~ the device} is provided with means which follows its rotation and is capable of shearing the vitrifiable material 
{ TAIL ~ Apparatus } 1 , wherein { HEAD ~ the device } is provided with means which follows its rotation and is capable of shearing the vitrifiable material
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH