A steam locomotive traveling by rail in the forest with smoke coming from the chimneyA steam locomotive traveling by rail in the forest with smoke coming from the chimney
Jet engine concept speed movement flight against the skyJet engine concept speed movement flight against the sky
Soviet single-engine fighter at the airfield after the battleSoviet single-engine fighter at the airfield after the battle
Twin-engined german bomber in the battle of britainTwin-engined German bomber in the Battle of Britain
Drawing of the soviet ant-25 single-engine aircraft in the skyDrawing of the Soviet ANT-25 single-engine aircraft in the sky
Using a protractor by an engineer in the old schoolUsing a protractor by an engineer in the old school