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