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1904 in science
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==Technology== * July 4 – [[Piero Ginori Conti]] demonstrates the use of [[geothermal power]] to generate electricity, at [[Larderello]] in Italy. * July 23 – A [[continuous track]] [[tractor]] is [[patent]]ed by [[David Roberts (engineer)|David Roberts]] of [[Richard Hornsby & Sons]] of [[Grantham]] in England.<ref>British Patent No. 16,345. {{cite book|first=Peter|last=Robinson|title=Lincoln's Excavators: The Ruston years 1875–1930|year=2003|location=Nynehead|publisher=Roundoak|isbn=1-871565-42-1}}</ref> * November 16 – [[John Ambrose Fleming]] patents the first [[thermionic]] [[vacuum tube]], the two-electrode [[diode]] ("oscillation valve" or [[Fleming valve]]).<ref>{{cite book|title=The Hutchinson Factfinder|publisher=Helicon|year=1999|isbn=978-1-85986-343-5}}</ref> * November 24 – A continuous track tractor is demonstrated by the [[Holt Manufacturing Company]] in the United States. * The first [[diesel engine]]d [[submarine]], the ''Z'', is built in France. * The [[Heckelphone]] variety of [[oboe]] is invented by [[Wilhelm Heckel]] and his sons. * The [[sleeve valve]] is invented by Charles Yale Knight. * The [[turbine]]-powered [[Bliss-Leavitt torpedo]], designed by [[Frank McDowell Leavitt]] and manufactured by the [[E. W. Bliss Company]] of [[Brooklyn]], is put into service by the United States Navy.<ref>{{cite book|last=Newpower|first=Anthony|url=https://books.google.com/books?id=eFZb_BqP10UC&q=%22Frank+McDowell+Leavitt%22&pg=RA1-PA18|title=Iron Men And Tin Fish: The Race to Build a Better Torpedo During World War II|location=Westport, Conn.|publisher=Greenwood Publishing Group|year=2006|page=18|isbn=0-275-99032-X}}</ref> * [[Lucien Bull]] produces the first successful [[chronophotography]] (of insect flight), working in France.<ref>Reported by him in "Motional mechanism of the insect wing", ''[[Comptes rendus de l'Académie des sciences]]'' '''138''':590–592 (29 February); "Application of the electric spark to the chrono-photography of rapid motions", ''Comptes rendus'' '''138''':155–157 (21 March); "Chronophotography of rapid motions", ''Bulletin de la Société Philomathiclue'' (Paris) (June 11); Synthesis in chronophotography, ''Bulletin de la Société Philomathiclue'' (November 12).</ref> * Rue Franklin Apartments, Paris, are completed by [[Auguste Perret]] and his brother Gustave, an early example of an exposed [[reinforced concrete]] frame building.<ref>{{cite web|url=http://www.greatbuildings.com/buildings/Rue_Franklin_Apartments.html|title=Rue Franklin Apartments|work=GreatBuildings|accessdate=2012-05-29}}</ref>
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