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exercise
exercise n. 1. (often exercises) a military drill or training maneuver. 2. (exercises) ceremonies: graduation exercises....
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drill
drill tool used to create a hole, usually in some hard substance, by its rotary or hammering action. Many different tools make up the drill family. The awl is a pointed instrument used for piercing small holes. In its early form it was a thorn or a tool of bone or chipped flint; many prehistoric aw...
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well
well aperture in the earth's surface through which substances in a natural underground reservoir, such as water, gas, oil, salt, and sulfur, can flow or be pumped to the surface. In the United States, until some years after the Civil War, the majority of wells were "open," i.e., holes dug in th...
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Deep Sea Drilling Project
Deep Sea Drilling Project U.S. program designed to investigate the evolution of ocean basins by core drilling of ocean sediments and underlying oceanic crust. Funded by the National Science Foundation, the project was directed by the Joint Oceanographic Institution for Deep Earth Sampling (JOIDES),...
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Project Mohole
Project Mohole program proposed in 1957 to drill a hole down to the boundary between the crust and the mantle , known as the Mohorovičić discontinuity at about 4 to 43 mi (7 to 70 km) below the earth's surface. Initiated by the American Miscellaneous Society, a loose organization of scie...
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Jethro Tull
Jethro Tull 1674-1741, English agriculturist and inventor. He studied methods of agriculture in England, France, and Italy and influenced British agriculture through his writings, which include The Horse-Hoeing Husbandry (1733). Tull advocated the use of manures, pulverizing the soil, planting wi...
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Nacogdoches
Nacogdoches , city (1990 pop. 30,872), seat of Nacogdoches co., E Tex., in a pine and hardwood forest area; settled 1779. Industries in the city include lumbering, livestock and poultry raising and processing, and the manufacture of feed, wood and electronic products, motor homes, and furniture. Tou...
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John Henry
John Henry legendary African American famous for his strength, celebrated in ballads and tales. In the most popular version of the story, John Henry tries to outwork a steam drill with only his hammer and steel bit. Although he succeeds in beating the machine, he dies of the strain. His legend orig...
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machine tool
machine tool power-operated tool used for finishing or shaping metal parts, especially parts of other machines. An establishment that is equipped with such tools and specializes in such work is known as a machine shop. Machine tools operate by removing material from the workpiece, much as a sculpto...
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Alaska North Slope
Alaska North Slope or Arctic North Slope, region, N Alaska, sloping from the Brooks Range N to the Arctic Ocean. In 1968 large petroleum reserves were found in the Prudhoe Bay area. In 1977 the 800-mi (1,287 km) Trans-Alaska pipeline was completed to carry oil S to the port of Valdez, on the ...
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