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  2. Linear-motion bearing - Wikipedia

    en.wikipedia.org/wiki/Linear-motion_bearing

    A linear-motion bearing or linear slide is a bearing designed to provide free motion in one direction. There are many different types of linear motion bearings. Motorized linear slides such as machine slides, X-Y tables, roller tables and some dovetail slides are bearings moved by drive mechanisms. Not all linear slides are motorized, and non ...

  3. Ball bearing - Wikipedia

    en.wikipedia.org/wiki/Ball_bearing

    Ball bearing. Working principle for a ball bearing; red dots show direction of rotation. A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races . The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.

  4. Bearing (mechanical) - Wikipedia

    en.wikipedia.org/wiki/Bearing_(mechanical)

    A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

  5. Washtub bass - Wikipedia

    en.wikipedia.org/wiki/Washtub_bass

    A small washtub bass being played. The washtub bass, or gutbucket, is a stringed instrument used in American folk music that uses a metal washtub as a resonator. Although it is possible for a washtub bass to have four or more strings and tuning pegs, traditional washtub basses have a single string whose pitch is adjusted by pushing or pulling on a staff or stick to change the tension.

  6. Voyages of Christopher Columbus - Wikipedia

    en.wikipedia.org/wiki/Voyages_of_Christopher...

    The Ciguayos refused to trade the amount of bows and arrows that Columbus desired; in the ensuing clash one Ciguayo was stabbed in the buttocks and another wounded with an arrow in his chest. [65] Because of the Ciguayos' use of arrows, Columbus named the inlet the Bay of Arrows (or Gulf of Arrows). [66]

  7. Navigational instrument - Wikipedia

    en.wikipedia.org/wiki/Navigational_instrument

    Navigational instrument. Navigational instruments are instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction, etc. to arrive at the port or point of destination.

  8. Second Schweinfurt raid - Wikipedia

    en.wikipedia.org/wiki/Second_Schweinfurt_raid

    The second Schweinfurt raid, [9] also called Black Thursday, was a World War II air battle that took place on 14 October 1943, over Nazi Germany between forces of the United States 8th Air Force and German Luftwaffe fighter arm ( Jagdwaffe ). The American bombers conducted a strategic bombing raid on ball bearing factories to reduce production ...

  9. Four-ball billiards - Wikipedia

    en.wikipedia.org/wiki/Four-ball_billiards

    Four-ball billiards. Four-ball billiards or four-ball carom (often abbreviated to simply four-ball, and sometimes spelled 4-ball or fourball) is a carom billiards game, played on a pocketless table with four billiard balls, usually two red and two white, one of the latter with a spot to distinguish it (in some sets, one of the white balls is yellow instead of spotted).