at least one reinforcing frame rib, attached to {TAIL ~ said stationary cylindrical casing} between said pair of {HEAD ~ opposite gables}, 
at least one reinforcing frame rib , attached to { TAIL ~ said stationary cylindrical casing } between said pair of { HEAD ~ opposite gables } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH