Still engine
... that the Still engine was a combined steam and diesel engine designed to save fuel by using the exhaust gases to heat the boiler?
... that the <b id="mwB-A"><a href="./Still_engine" id="mwB-E" rel="mw:WikiLink" title="Still engine">Still engine</a></b> was a combined <a href="./Steam_engine" id="mwB-I" rel="mw:WikiLink" title="Steam engine">steam</a> and <a href="./Diesel_engine" id="mwB-M" rel="mw:WikiLink" title="Diesel engine">diesel engine</a> designed to save fuel by using the exhaust gases to heat the <a href="./Boiler" id="mwB-Q" rel="mw:WikiLink" title="Boiler">boiler</a>?