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rack lever

См. также в других словарях:

  • rack-and-lever jack — ˈ ̷ ̷ ̷ ̷ˈ ̷ ̷ ̷ ̷ noun Etymology: rack (III) : ratchet jack …   Useful english dictionary

  • perpetual lever — Wheel Wheel (hw[=e]l), n. [OE. wheel, hweol, AS. hwe[ o]l, hweogul, hweowol; akin to D. wiel, Icel. hv[=e]l, Gr. ky klos, Skr. cakra; cf. Icel. hj[=o]l, Dan. hiul, Sw. hjul. [root]218. Cf. {Cycle}, {Cyclopedia}.] [1913 Webster] 1. A circular… …   The Collaborative International Dictionary of English

  • pin rack — Pin Pin, n. [OE. pinne, AS. pinn a pin, peg; cf. D. pin, G. pinne, Icel. pinni, W. pin, Gael. & Ir. pinne; all fr. L. pinna a pinnacle, pin, feather, perhaps orig. a different word from pinna feather. Cf. {Fin} of a fish, {Pen} a feather.] 1. A… …   The Collaborative International Dictionary of English

  • Escapement — redirects here. For the fisheries term for the stock surviving fishing pressures over a spawning cycle, see Spawn (biology). For other uses, see Escapement (disambiguation). A deadbeat escapement, used in many pendulum clocks. Click above to see… …   Wikipedia

  • Peter Litherland — (1756 1805) was a watchmaker and inventor. He was born in Warrington and later moved to Liverpool, which was then the centre of the watchmaking trade. In 1791 he patented the rack lever escapement for watches, which was more accurate than the… …   Wikipedia

  • Striking clock — The Clock Tower of the Palace of Westminster in London, commonly referred to as Big Ben, is a famous striking clock. A striking clock is a clock that sounds the hours audibly on a bell or gong. In 12 hour striking, used most commonly in striking… …   Wikipedia

  • Railroad switch — For other uses, see Switch (disambiguation). A right hand railroad switch with point indicator pointing to right …   Wikipedia

  • Snowdon Mountain Railway — Rheilffordd yr Wyddfa Half way up the Mountain Overview …   Wikipedia

  • Crossbow — This article is about the weapon. For other uses, see Crossbow (disambiguation). Sketch by Leonardo da Vinci, c. 1500 A crossbow is a weapon consisting of a bow mounted on a stock that shoots projectiles, often called bolts or quarrels. The… …   Wikipedia

  • Mechanical calculator — An old Russian mechanical calculator. A mechanical calculator is a device used to perform the basic operations of arithmetic. Mechanical calculators are comparable in size to small desktop computers and have been rendered obsolete by the advent… …   Wikipedia

  • printing — /prin ting/, n. 1. the art, process, or business of producing books, newspapers, etc., by impression from movable types, plates, etc. 2. the act of a person or thing that prints. 3. words, symbols, etc., in printed form. 4. printed material. 5.… …   Universalium

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