spring galvanometer

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• Galvanometer — D Arsonval/Weston galvanometer movement with the moving coil shown in red. A galvanometer is a type of ammeter: an instrument for detecting and measuring electric current. It is an analog electromechanical transducer that produces a rotary… …   Wikipedia

• 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

• watch — /woch/, v.i. 1. to be alertly on the lookout, look attentively, or observe, as to see what comes, is done, or happens: to watch while an experiment is performed. 2. to look or wait attentively and expectantly (usually fol. by for): to watch for a …   Universalium

• Voltmeter — Demonstration voltmeter from a physics class A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage… …   Wikipedia

• Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …   Wikipedia

• Multimeter — A digital multimeter A multimeter or a multitester, also known as a VOM (Volt Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability …   Wikipedia

• Faraday, Michael — born Sept. 22, 1791, Newington, Surrey, Eng. died Aug. 25, 1867, Hampton Court English physicist and chemist. Son of a blacksmith, he received only a basic education in a church Sunday school, but he went to work as an assistant to Humphry Davy,… …   Universalium

• Ammeter — Amperemeter redirects here. For the unit of measurement, see Ampere meter. Demonstration model of a moving iron ammeter. As the current through the coil increases, the plunger is drawn further into the coil and the pointer deflects to the right …   Wikipedia

• biophysics — biophysical /buy oh fiz i keuhl/, adj. biophysically, adv. biophysicist /buy oh fiz euh sist/, n. /buy oh fiz iks/, n. (used with a sing. v.) the branch of biology that applies the methods of physics to the study of biological structures and… …   Universalium

• Optical tweezers — (originally called single beam gradient force trap ) are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch… …   Wikipedia

• English inventions and discoveries — are objects, processes or techniques which owe their existence either partially or entirely to a person born in England; in some cases, their Englishness is determined by the fact that they were born in England, of non English people working in… …   Wikipedia