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optical lever

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  • optical lever — noun : an arm or lever the displacement of which is measured by an attached mirror and a fixed telescope and scale commonly used for measuring small lengths …   Useful english dictionary

  • perception — perceptional, adj. /peuhr sep sheuhn/, n. 1. the act or faculty of apprehending by means of the senses or of the mind; cognition; understanding. 2. immediate or intuitive recognition or appreciation, as of moral, psychological, or aesthetic… …   Universalium

  • Photoconductive atomic force microscopy — (pc AFM) is a scientific technique.. Multi layer photovoltaic cells have gained popularity since mid 1980s.[1] At the time, research was primarily focused on single layer photovoltaic (PV) devices between two electrodes, in which PV properties… …   Wikipedia

  • vibrographs — Devices used to measure vibrations of an airplane. These are used mainly for measuring airframe vibrations. Mechano optical vibrometer. The motion given to the probe by the vibrating surface is used to rock a mirror and thereby actuate an optical …   Aviation dictionary

  • optimeter — äpˈtiməd.ə(r) noun Etymology: optic + meter : an instrument for measuring the accuracy of gage blocks or similar devices by means of an optical lever …   Useful english dictionary

  • thermorelay — |thər(ˌ)mō+ noun Etymology: therm + relay : a device for detecting very small optical lever deflections in which a reflected beam of radiation falls on a sensitive thermocouple so arranged as to measure very small deflections …   Useful english dictionary

  • History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …   Wikipedia

  • Headlamp — Headlight redirects here. For other uses, see Headlight (disambiguation). High Beams redirects here. For the urban legend also known by that name, see Killer in the backseat. A motor scooter s front with an impractical number and variety of… …   Wikipedia

  • Voting machine — Election technology Certification of voting machines Independent Testing Authority (ITA) NVLAP VVSG End to end auditable voting systems Help America Vote Act Independent verific …   Wikipedia

  • Heckler & Koch MP5 — Type Submachine gun Place of origin …   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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