Explanatory notes
… elements (i.e., cylinder, piston, connecting-rod, crank shaft, flywheel, inlet and exhaust valves, etc.), but differ … heavy fluid fuels such as heavy petroleum or coal tar oils, shale oils, vegetable oils (ground-nut, castor, palm, etc.). … for propelling motorcars , tractors, locomotives or ships or in electric power stations, etc. The engines of …