On preview cassette 211043 E "The development of power from the stone age to the atomic power of today. Man first used his muscles, then developed the wheel, the oar and the bucket. To aid him, he domesticated animals, used sails, windmills, and waterwheels. Then came the steam engine, gasoline and electric motors, jet propulsion and the atom." Includes good shots of lava erupting, forest fire, machinery cogs turning. 1272 A: print #2 1272 B: A-roll 1272 C: B-roll 1272 D: A-wind neg. den. trk (orig. can said do not use) 1272 E: A-wind neg. dens. trk. 1272 F: Interneg.