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locking
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air lock
air lock compartment connecting two different environments, usually at different pressures, that enables personnel to transfer from one environment to the other. Space capsules have air locks to enable astronauts to move between the pressurized cabin and the near vacuum of space. A more common... Read more |
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canal lock
canal lock stretch of water enclosed by gates, one at each end, built into a canal or river for the purpose of raising or lowering a vessel from one water level to another. A lock may also be built into the entrance of a dock for the same purpose. When the ship is to be raised to a higher level, it... Read more |
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Sault Sainte Marie
Sault Sainte Marie , city (1991 pop. 81,476), S Ont., Canada, on the St. Marys River opposite Sault Ste Marie, Mich. A bridge connects the two cities. Sault Ste Marie is an important port and manufacturing center. Iron and steel, lumber, pulp and paper products, and chemicals are made there;... Read more |
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McDonald Observatory
McDonald Observatory astronomical observatory located on Mt. Locke, near Fort Davis, Tex.; founded in 1932, sponsored by the Univ. of Texas in cooperation with the Univ. of Chicago. Its equipment includes 107-in. (272-cm), 82-in. (208-cm), 32-in. (81-cm), and 30-in. (76-cm) reflecting telescopes.... Read more |
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Saint Lawrence Seaway
Saint Lawrence Seaway international waterway, 2,342 mi (3,769 km) long, consisting of a system of canals, dams, and locks in the St. Lawrence River and connecting channels between the Great Lakes; opened 1959. It provides passage for large oceangoing vessels into central North America. The seaway... Read more |
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Alain Leroy Locke
Alain Locke 1886-1954 Educator, editor, author At a Glance… Became an Educa... Read more |
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lock
Lock Background Locks have been used to fasten doors against thieves since earliest times. The Old Testament contains several references to locks, and the first archaeological evidence of locks are about 4,000 years old. These are Egyptian locks depicted in the pyramids.... Read more |
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atomism
atomism philosophic concept of the nature of the universe, holding that the universe is composed of invisible, indestructible material particles. The theory was first advanced in the 5th cent. BC by Leucippus and was elaborated by Democritus. Epicurus restated the doctrine, giving the atoms weight.... Read more |
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lock and key
lock and key fastening fitted to an entryway, such as a gate or door, or a container, such as a cabinet, drawer or safe, to keep it closed and/or prevent unauthorized access or use. Locks typically consist of a sliding, pivoted, or rotary bolt protected by a fixed or movable object. A lock may be... Read more |
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Shuttle nears space station linkup
...CANAVERAL, Fla. Space shuttle Atlantis closed in on the international space station Friday for a late...travelers-five on Atlantis and three on space...to install the air lock, beginning ... |