Word: heat
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Dates: during 1960-1969
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...major battles. At Bull Run, in July 1961, 70,000 spectators cheered more than 2,000 men and boys as they replayed the battle, charging across the battlefield, shooting blanks, and falling off their horses. Casualties at 1961's Bull Run: 185 cases of heat exhaustion, twelve bee stings...
...week when four silvery MIG-17s tangled briefly with U.S. Navy Phantom jets, then fled toward the Chinese island of Hainan, 150 miles east of North Viet Nam. In terms of aerodynamics performance, the slow (730 m.p.h.) MIGs were clearly inferior to the 1,600-m.p.h. Phantoms with their heat-seeking Sidewinder rockets. One of the planes was sent flaming into the clouds while the others scuttled for home. At week's end both Peking and the Pentagon were denying it was theirs. Peking quickly shrilled that it had won the fight, and that one Phantom's Sidewinder...
...scientists at California's Atomics International, who built SNAP-10A for the Atomic Energy Commission, produced a machine like nothing now working on earth. Its fuel is 4.75 kilograms (10.5 lbs.) of uranium 235, the nuclear explosive used in the first atomic bomb. Packed into 37 tubes of heat-resistant nickel alloy, the fuel is mixed with zirconium hydride, which acts as a moderator, slowing down the high-energy neutrons released by fissioning atoms of U 235. The heat of the reactor is carried away by a sodium-potassium alloy (NaK) that turns to liquid...
...reactor and its conical support section went into orbit 800 miles above the earth. As soon as SNAP's scientists were convinced that the proper orbit had been attained, they sent a signal that told the reflector mechanism to reduce neutron leakage. Slowly the nuclear reaction started; heat built up in the core, and a magnetic pump circulated the metallic coolant at 1020°F. through tubes in the skin of the support structure. The inner ends of 2880 pellets of a germanium-silicon material were heated while their outer ends were kept comparatively cool by heat radiation into...
...laboratory the vortex increases the velocity of the air in propotion to the screen's radius. With a screen speed of four rotations per second, Ying has produced winds up to seven miles per hour near the whirl. While the rotating screen sucks air outwards, the rising heat of the fire pulls air toward the flame; at speeds faster than four revolutions per second, the screen's pull is greater than that of the fire and the whirl degenerates into a normal short flame...