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Jens Olsen (27 July 1872 – 17 November 1945) was a clockmaker, locksmith and astromechanic who built the famous world clock located in the city hall of Copenhagen, the Rådhus. He was born in Ribe, Denmark. Ever since he was a small child, Olsen was interested in clocks and other mechanical devices.
The invention of the candle clock was attributed by the Anglo-Saxons to Alfred the Great, king of Wessex (r. 871–889), who used six candles marked at intervals of one inch (25 mm), each made from 12 pennyweights of wax, and made to be 12 centimetres (4.7 in) in height and of a uniform thickness.
In 1752 Bartolomeo Ferracina started work on replacing the clock, having successfully tendered for the job in public competition. He installed a new movement, removed the planetary dials, installed a rotating moon ball to show the phase, and changed the numbering of the clock face from the old Italian style (I to XXIIII in Roman numerals) to the 12-hour style, using two sets of Arabic numerals ...
The City of Lights (French: La Cité des lumières) is a 1938 French drama film directed by Jean de Limur and starring Madeleine Robinson, Daniel Lecourtois, and Claire Gérard. [ 1 ] [ 2 ] [ 3 ] The film's sets were designed by art director Émile Duquesne.
A facade was added in 1529 when the clock was moved to its current position. [3] The mechanism was electrified in the 1920s and it was restored in 1997. [citation needed] As of 9 July 2022, the clock movement itself is not functional in any way. There is an electrical solenoid that rings one of the two bells in the tower on the 1/4 hr.
The astrarium made by Giovanni Dondi dall'Orologio showed hour, year calendar, movement of the planets, Sun and Moon. Reconstruction, Museo Nazionale Scienza e Tecnologia Leonardo da Vinci , Milan. Dondi's quaedani apostillae or notes on a letter of Seneca, mentioned in a manuscript of Gasparino Barzizza from 1411, have not been traced.
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1962 Nick Holonyak Jr. develops the first practical visible-spectrum (red) light-emitting diode. 1963 Kurt Schmidt invents the first high pressure sodium-vapor lamp. [18] 1972 M. George Craford invents the first yellow light-emitting diode. 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.