1950s: Glass flask of boiling water on flame. Steam escapes spout at end of flask and spins turbine wheel. Man in white suit turns off flame. Illustration: "RADIANT ENERGY" and spiral line or wave.
1950s: Man at laboratory table places thermometer in glass flask. Top of glass flask: thermometer, spout, and stick with turbine wheel. Bunsen burner heats flask. Thermometer reaches 100 Celsius.
1950s: Bunsen burner boils water, steam spins turbine, sign reads "HEAT ENERGY". Batteries power motor, sign reads "ELECTIRCAL ENERGY". Man demonstrates Geiger counter, sign reads "NUCLEAR ENERGY".