Example image of eyePlorer eyePlorer map for 'Steam engine': Heat engine Steam Work (physics) Working fluid Industrial Revolution Coal Water wheel Windmill Wood fuel Prime mover Steam locomotive Steam tractor Electric power Steam turbine External combustion engine Geothermal gradient Nuclear power Solar power Rankine cycle Beam engine Portable engine Stationary steam engine Boiler (steam generator) Pile driver Steam hammer Reciprocating motion Pumping station Steam clock Internal combustion engine Steam aircraft Electric motor Electrical grid Cogeneration Advanced steam technology Rolling mill Steam donkey Winding engine Cable car (railway) Cable railway Factory Mill (grinding) Stationary engine Logging Traction engine Aeolipile Fireless locomotive Hero of Alexandria Power-to-weight ratio Steam bus Steam car