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A stroboscope, also known as a strobe, is an instrument used to make a cyclically moving object appear to be slow-moving, or stationary. It consists of either a rotating disk with slots or holes or a lamp such as a flashtube which produces brief repetitive flashes of light. Usually, the rate of the stroboscope is adjustable to different ...
Stroboscopic effect is one of the particular temporal light artefacts.In common lighting applications, the stroboscopic effect is an unwanted effect which may become visible if a person is looking at a moving or rotating object which is illuminated by a time-modulated light source.
When it was introduced in the French newspaper Le Figaro in June 1833, the term 'phénakisticope' was explained to be from the root Greek word φενακιστικός phenakistikos (or rather from φενακίζειν phenakizein), meaning "deceiving" or "cheating", [2] and ὄψ óps, meaning "eye" or "face", [3] so it was probably intended loosely as 'optical deception' or 'optical illusion'.
Simon Stampfer, Lithograph by Josef Kriehuber, 1842. Simon Ritter von Stampfer (26 October 1792 (according to other sources 1790)), in Windisch-Mattrai, Archbishopric of Salzburg, today called Matrei in Osttirol, Tyrol – 10 November 1864 in Vienna) was an Austrian mathematician, surveyor and inventor.
He patented the first electric stroboscope in 1917, [1] building at the same time a camera capable of shooting 1,000 frames per second. Oehmichen N°2 1922. His first successful flight with a helicopter took place on 18 February 1921.
A Crookes radiometer in action. The radiometer is made from a glass bulb from which much of the air has been removed to form a partial vacuum.Inside the bulb, on a low-friction spindle, is a rotor with several (usually four) vertical lightweight vanes spaced equally around the axis.
The IETF language tags have registered fr-1694acad for Early Modern French, "17th century French, as catalogued in the "Dictionnaire de l'académie françoise", 4eme ed. 1694; frequently includes elements of Middle French, as this is a transitional period". [5]
Étienne Jules Marey around 1880, by Félix Nadar.. Étienne-Jules Marey (French: [etjɛn ʒyl maʁɛ]; 5 March 1830, Beaune, Côte-d'Or – 15 May 1904, [1] Paris) was a French scientist, physiologist and chronophotographer.