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DK Science: Friction

LUBRICATING MACHINERYSTREAMLININGFIND OUT MOREIf you kick a ball across a playground, it bounces and rolls on the ground’s rough surface and soon comes to a halt. What slows it down is friction…

grinding

(Encyclopedia) grinding, process by which surface material is removed from an object, usually metal, by the abrasive action of a rotating wheel or a moving belt that contains abrasive grains. A…

DK Science: Robots

UNDERWATER EYEHOME HELPINDUSTRIAL ARMHUMANOID ROBOTSFIND OUT MORERobots are machines that behave a bit like people, and can perform difficult or repetitive tasks. HUMANOID ROBOTS even look like…

Raymond A. Kroc

restaurateurBorn: 10/5/1902Birthplace: Chicago, Ill. Having dabbled in everything from real estate to amublance driving, Kroc finally settled into a career of selling Mult-A-Mixers, machines…

efficiency

(Encyclopedia) efficiency. 1 In business and industry, see industrial management; productivity. 2 In physics, seemachine; work.

combing

(Encyclopedia) combing, process that follows carding in the preparation of fibers for spinning, lays the fibers parallel, and removes noils (short fibers). The modern combing machine is a specialized…

Hyatt, John Wesley

(Encyclopedia) Hyatt, John Wesley, 1837–1920, American inventor, b. Starkey, N.Y. He is known especially for his development of celluloid; with his brothers, he began its manufacture in 1872. He also…

typewriter

(Encyclopedia) typewriter, instrument for producing by manual operation characters similar to those of printing. Corresponding to each key on the instrument's keyboard is a steel type. Activated…

Electrician

What is this job like? Without these workers, there would be no lights, no computers, and no TVs plugged into our walls. Electricians bring us electricity. They put in the wires that carry…

Marly-le-Roi

(Encyclopedia) Marly-le-RoiMarly-le-Roimärlēˈ-lə-rwä [key], town (1990 pop. 16,775), Yvelines dept., N France, on the Seine River near Versailles. Nearby is the hamlet of Marly-la-Machine, where in…