Word: pipeful
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Dates: during 1960-1969
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...heyday there was no more festive scene than the dinner parties for 90, presided over by vivacious Dolly Madison, "a fine, portly, buxsom dame." Virginians not only maintained standards; they set them as well, as Frontiersman Andrew Jackson's Hermitage (opposite) proves. "Old Hickory" and his devoted, pipe-smoking Rachel cheerfully put up with log cabins for 15 years before they realized their dream of a grand white-colonnaded house of their own. Jackson built the Hermitage in 1819, four years after the Battle of New Orleans. Rachel tragically died 2½ months before he entered the Presidency. During...
...fuel is uranyl sulphate dissolved in heavy water (which does not absorb as many neutrons as ordinary water). When this solution is flowing in a small-bore pipe, it does not react, because the fissionable uranium atoms are too strung out to form a critical mass. But when the fuel solution flows into a spherical reaction chamber, the compact mass becomes critical. A nuclear chain reaction starts, and heats the solution. Before the reaction goes too far, the solution is sucked away by pumps and forced through a heat exchanger, where it heats ordinary water to produce high-pressure steam...