Word: coppered
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...Violent Instrument. Essentially, a shock tube is a strong-walled metal pipe, a few inches in diameter, from which the air can be pumped. At one end, a section is walled off by a copper diaphragm: that section is filled with an explosive mixture of oxygen and hydrogen. At the other end is a vacuum tank, and just ahead of it is a tiny nose-cone test model. When an electric spark explodes the oxygen-hydrogen, it bursts through the diaphragm and into the vacuum. Ahead of it rushes a hot shock wave that hits the test model at actual...
Snub Nose. The easiest, fastest cone to develop was the "heat-sink"' type, made of thick copper. Since copper is an excellent conductor of heat, the cone's front surface could stay solid until the whole mass was near the melting point. To many, it seemed obvious that a nose cone should be made slim and sharp-pointed, capable of piercing the atmosphere with low resistance. But the contrary proved to be the case. Dr. H. Julian Allen of the National Advisory Committee for Aeronautics argued conclusively that a blunt nose was better for the heat-sink cone...
...united in the determination to destroy the Central African Federation, a nation tacked together by Britain in 1953 in a desperate effort to make a stable, viable country out of three dissimilar territories carved out of the bush by Empire Builder Cecil Rhodes. The Federation consists of Nyasaland, copper-rich Northern Rhodesia, and Southern Rhodesia, the last being the only one of the three that includes a large (211,000) white settler population. It is Southern Rhodesia's whites, who are sentimentally linked to the South Africans in race policy, that Dr. Banda and Kaunda want to escape. Each...
...Shaped Seals. After figuring in early legends, Dilmun takes slightly more tangible form in Sumerian writings as a city on an island three days' sail down the Persian Gulf. Merchants from Ur traded there, and clay-written records tell that they brought woolen goods, returning with cargoes of copper, ivory and gold. This suggests that Dilmun acted as middleman between Mesopotamia and the civilization of the Indus Valley in Pakistan. In both places have been found a few peculiar, disk-shaped stone seals. Since most Mesopotamian seals are cylindrical and Indus seals are square, archaeologists have long speculated that...
...fine eye for country") picked it out, hired native laborers to cut a trench into it. Done properly, this is slow work: for years the archaeologists worked on the mound. Piled in layers were vertical walls and stamped clay floors all mixed with bits of pottery and copper...