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1 constant voltage dynamo
dinamo untuk tegangan tetap -
2 constant-voltage dynamo
English-Spanish technical dictionary > constant-voltage dynamo
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3 constant voltage dynamo
நிலையான உவோற்றுத்தைனமோ -
4 constant voltage control dynamo
prądnica o regulacji napięciowejEnglish-Polish dictionary for engineers > constant voltage control dynamo
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5 constant
1 adjCOMP&DP, ELECTRON, MATH, MECH, PHYS constante2 nCOMP&DP, ELECTRON, MATH, MECH, PHYS constante f, invariante f -
6 Brush, Charles Francis
[br]b. 17 March 1849 Euclid, Michigan, USAd. 15 June 1929 Cleveland, Ohio, USA[br]American engineer, inventor of a multiple electric arc lighting system and founder of the Brush Electric Company.[br]Brush graduated from the University of Michigan in 1869 and worked for several years as a chemist. Believing that electric arc lighting would be commercially successful if the equipment could be improved, he completed his first dynamo in 1875 and a simplified arc lamp. His original system operated a maximum of four lights, each on a separate circuit, from one dynamo. Brush envisaged a wider market for his product and by 1879 had available on arc lighting system principally intended for street and other outdoor illumination. He designed a dynamo that generated a high voltage and which, with a carbon-pile regulator, provided an almost constant current permitting the use of up to forty lamps on one circuit. He also improved arc lamps by incorporating a slipping-clutch regulating mechanism and automatic means of bringing into use a second set of carbons, thereby doubling the period between replacements.Brush's multiple electric arc lighting system was first demonstrated in Cleveland and by 1880 had been adopted in a number of American cities, including New York, Boston and Philadelphia. It was also employed in many European towns until incandescent lamps, for which the Brush dynamo was unsuitable, came into use. To market his apparatus, Brush promoted local lighting companies and thereby secured local capital.[br]Principal Honours and DistinctionsChevalier de la Légion d'honneur 1881. American Academy of Arts and Sciences Rumford Medal 1899. American Institute of Electrical Engineers Edison Medal 1913.Bibliography18 May 1878, British patent no. 2,003 (Brush dynamo).11 March 1879, British patent no. 947 (arc lamp).26 February 1880, British patent no. 849 (current regulator).Further ReadingJ.W.Urquhart, 1891, Electric Light, London (for a detailed description of the Brush system).H.C.Passer, 1953, The Electrical Manufacturers: 1875–1900, Cambridge, Mass., pp. 14– 21 (for the origins of the Brush Company).S.Steward, 1980, in Electrical Review, 206:34–5 (a short account).See also: Hammond, RobertGW -
7 Thomson, Elihu
SUBJECT AREA: Electricity[br]b. 29 March 1853 Manchester, Englandd. 13 March 1937 Swampscott, Massachusetts, USA[br]English (naturalized) American electrical engineer and inventor.[br]Thomson accompanied his parents to Philadelphia in 1858; he received his education at the Central High School there, and afterwards remained as a teacher of chemistry. At this time he constructed several dynamos after studying their design, and was invited by the Franklin Institute to give lectures on the subject. After observing an arc-lighting system operating commercially in Paris in 1878, he collaborated with Edwin J. Houston, a senior colleague at the Central High School, in working out the details of such a system. An automatic regulating device was designed which, by altering the position of the brushes on the dynamo commutator, maintained a constant current irrespective of the number of lamps in use. To overcome the problem of commutation at the high voltages necessary to operate up to forty arc lamps in a series circuit, Thomson contrived a centrifugal blower which suppressed sparking. The resulting system was efficient and reliable with low operating costs. Thomson's invention of the motor meter in 1882 was the first of many such instruments for the measurement of electrical energy. In 1886 he invented electric resistance welding using low-voltage alternating current derived from a transformer of his own design. Thomson's work is recorded in his technical papers and in the 700plus patents granted for his inventions.The American Electric Company, founded to exploit the Thomson patents, later became the Thomson-Houston Company, which was destined to be a leader in the electrical manufacturing industry. They entered the field of electric power in 1887, supplying railway equipment and becoming a major innovator of electric railways. Thomson-Houston and Edison General Electric were consolidated to form General Electric in 1892. Thomson remained associated with this company throughout his career.[br]Principal Honours and DistinctionsChevalier and Officier de la Légion d'honneur 1889. American Academy of Arts and Sciences Rumford Medal 1901. American Institute of Electrical Engineers Edison Medal 1909. Royal Society Hughes Medal 1916. Institution of Electrical Engineers Kelvin Medal 1923, Faraday Medal 1927.Bibliography1934, "Some highlights of electrical history", Electrical Engineering 53:758–67 (autobiography).Further ReadingD.O.Woodbury, 1944, Beloved Scientist, New York (a full biography). H.C.Passer, 1953, The Electrical Manufacturers: 1875–1900, Cambridge, Mass, (describes Thomson's industrial contribution).K.T.Compton, 1940, Biographical Memoirs of Elihu Thomson, Washington, DCovides an abridged list of Thomson's papers and patents).GW
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