Electrical power generating arrangement with computer control for varying {HEAD ~ engine speed} as {TAIL ~ a function} of load demand 
as
Electrical power generating arrangement with computer control for varying { HEAD ~ engine speed } as { TAIL ~ a function } of load demand
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH