Word: beams
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Dates: during 1960-1969
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...Raise High the Roof Beam, Salinger...
...Ride has 16 plastic bubbles orbiting 80 feet above the boardwalk. For downward exploration the Neptune Diving Bell encloses 30 people, drops them 35 feet down to an "ocean floor" where live porpoises play. Further along is the Double Sky Wheel, a king-sized dumbbell with gyratory center beam supporting two independent wheels that can't decide whether to plunge suicidally earthward or whiz away toward Mars...
...Raise High the Roof Beam, Carpenters and Seymour An Introduction, Salinger...
...laboratory, but warheads plunging down from space hardly can be expected to carry lenses to expedite their own destruction. To fuse a steel casing weighing 100 Ibs. would require a laser light strong enough to deliver 807 kilowatts of energy to it for a full minute. If the beam were to hit the warhead 30 miles above the earth, it would be spread out so much that only 0.5% of its energy would be effective. Thus the power of the whole beam-even without allowing for dimming as it passes through the atmosphere-would have to be 161,400 kilowatts...
Laser death rays would need even more power if they were based on the moon-where power is in short supply. Dr. Thirring figures that after traveling from the moon, even the best-focused laser beam would cover a circle on the earth two miles in diameter. Even the light of a 1,000,000-kilowatt moon-based laser would increase the natural sunlight on this large area by only 10% . To do appreciable damage to one earthly city would call for a lunar powerhouse many times larger than any that has ever been built on earth...