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Archimedes Screw , Archimedes' screw Machine used for raising water, thought to have been invented by Archimedes in the 3rd century bc. The most common form of the mach… chamber , cham·ber / ˈchāmbər/ • n. 1. a hall used by a legislative or judicial body. ∎ the body that meets in such a hall. ∎ any of the houses of a legislatur… Cloud Chamber , cloud chamber
cloud chamber, device used to detect elementary particles and other ionizing radiation. A cloud chamber consists essentially of a close… United States Chamber Of Commerce , The U.S. Chamber of Commerce is the world's largest not-for-profit federation of businesses, representing more than 3 million businesses and organiza… Whittaker Chambers , Whittaker Chambers
Whittaker Chambers
In 1948 TIME magazine editor Whittaker Chambers (1901-1961) testified that in the 1930s he helped organize a Co… Sewing Machine , Background
Before 1900, women spent many of their daylight hours sewing clothes for themselves and their families by hand. Women also formed the majo…
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