projects demonstrate composition of objects, how substances are affected by various forms of energy--heat, light, sound, electricity, mechanical energy, etc. How a thermometer measures heat, how an electric bulb emits light, how shadows are formed, how to make a periscope, how to make a rainbow, etc. Unabridged republication of the original (1959) edition.
103 projects demonstrate composition of objects, how substances are affected by various forms of energy — heat, light, sound, electricity, mechanical energy, more. How a thermometer measures heat, how an electric bulb emits light, how shadows are formed, how to make a periscope, how to make a rainbow, more. Over 100 illustrations.
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