Notes

lang: eng lang: ger lang: 104 p. : ill. (chiefly col.) Summary: Shows a range of activities, games and toys to make that involve one of the four elements: earth, water, fire or air. The projects introduce basic scientific principles -- such as gravity, momentum and light refraction. Instructions and diagrams are provided for making projects such as a waterwheel, paddle-steamer, propeller plane, parachute, windmill, simple pendulum clock, spinning tops and a hot-air balloon Translated from German