stone cylinder
71percussion instrument — a musical instrument, as the drum, cymbal, triangle, xylophone, or piano, that is struck to produce a sound, as distinguished from string or wind instruments. [1870 75] * * * A musical instrument that is struck (or sometimes shaken or scraped) to …
72energy conversion — ▪ technology Introduction the transformation of energy from forms provided by nature to forms that can be used by humans. Over the centuries a wide array of devices and systems has been developed for this purpose. Some of these energy …
73Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …
74African architecture — Introduction the architecture of native Africa, particularly of sub Saharan Africa. In areas where Islam and Christianity linked Africa to the rest of the world in precolonial times, architecture predominates among the visual arts. Included …
75Manhattan Project — This article is about the atomic bomb project. For other uses, see Manhattan Project (disambiguation). Manhattan District The Manhattan Project created the first nuclear bombs. The Trinity test …
76Diamond core drill — bits (sometimes called hole saws) are used to bore holes in brick, concrete, glass, and stone. They are not generally used with softer materials. The bit consists of a metal cylinder, usually relatively soft steel mounted on an arbor. Industrial… …
77List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …
78Cars in Miami Vice — The cars of Miami Vice mainly involve the Ferrari Daytona Spyder and the Ferrari Testarossa, but also include other automobiles driven by the characters on the show. Currently the Ferrari Daytona (kit car) used on the show, and the Ferrari… …
79pottery — /pot euh ree/, n., pl. potteries. 1. ceramic ware, esp. earthenware and stoneware. 2. the art or business of a potter; ceramics. 3. a place where earthen pots or vessels are made. [1475 85; POTTER1 + Y3] * * * I One of the oldest and most… …
80Crank (mechanism) — A crank is an arm attached at right angles to a rotating shaft by which reciprocating motion is imparted to or received from the shaft. It is used to change circular into reciprocating motion, or reciprocating into circular motion. The arm may be …
