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