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Stanhopes or Stanho-scopes are optical devices that enable the viewing of microphotographs without using a microscope.〔''(Focal encyclopedia of photography )'' By Michael R. Peres Focal Press, 2007 ISBN 978-0-240-80740-9〕〔(The Strad Magazine October 2005 pp. 51-54 )〕 They were invented by René Dagron in 1857.〔 Dagron bypassed the need for an expensive microscope to view the microscopic photographs by attaching the microphotograph at the end of a modified Stanhope lens.〔 He called the devices ''bijoux photo-microscopiques'' or ''microscopic photo-jewelry''.〔(The Photographic Journal ) By Royal Photographic Society of Great Britain Jan. 15 1864〕 In 1862, Dagron displayed the devices at the Exhibition in London, where he got an "Honourable Mention" and presented them to Queen Victoria.〔(Chronology of Microfilm Developments 1800 – 1900 ) from UCLA〕 In 1864 Dagron became famous when he produced a stanhope optical viewer which enabled the viewing of a microphotograph , (equivalent in size to the head of a pin),〔 that included the portraits of 450 people.〔(Biographical dictionary of the history of technology ) By Lance Day, Ian McNeil ISBN 0-415-06042-7,ISBN 978-0-415-06042-4 p. 187〕〔(La photographie et ses applications aux sciences, aux arts et à l'industrie ) Author Julien Lefèvre Publisher J.-B. Baillière et fils, 1888 Original from the University of Michigan Digitized Jan 13, 2009 381 pages p. 339 Quote: Prèmiere application: les bijoux photographique. "...Elles firent leur apparition aux expositions de 1859 et de 1867, sous la forme de petits carrés de la dimension d' une tête d'épingle et renfermés dans une petite lunette: sur ce carré l'on apercevait un grand nombre d'objets, par exemple les portraits des 450 députés de l'empire" Translation: "They made their appearance in the exhibitions of 1859 and 1867, in the form of small square the size of a pinhead and enclosed in a small telescope: in this square you could see a large number of objects, example the portraits of 450 members of the empire" provided by Google , (Book in pdf )〕 == History == In 1851 John Benjamin Dancer invented microphotographs using a collodion process and a microscope converted to a camera.〔 This resulted in a microphotograph about in area.〔 The main disadvantage of Dancer's method was that the viewing of the microphotographs required a microscope which was at the time an expensive instrument.〔 In 1857 Dagron solved the problem by inventing a method of mounting the microphotographs at the end of a small cylindrical lens.〔〔(A history and handbook of photography (1877) ) Author: Tissandier, Gaston, 1843-1899 Subject: Photography; Photography Publisher: New York : Scoville Manufacturing Quote: "It is a miniature microscope with considerable magnifying powers. The image seen through it is magnified about three hundred times." and "The lens used for toy micropliotographs resembles the Stanhope lens, but is not cut down in the centre to form a diaphragm. It consists simply of a cylinder of flint glass, or long plano-convex lens whose focus is its ovm plain surface, to which the photograph is attached with Canada balsam."〕 Dagron modified the Stanhope lens by sectioning the normally biconvex Stanhope lens and introducing a planar section so that the plane was located at the focal length of the convex side of the cylindrical lens.〔〔 This produced a plano-convex lens, where Dagron was able to mount the microscopic photograph on the flat side of the lens using Canada balsam as adhesive.〔〔 This arrangement enabled the picture to be focused.〔 The Stanhope optical viewers were also mounted inside the bows of violins by French violin maker Jean-Baptiste Vuillaume, probably using Dagron's methods and equipment.〔 The violin Stanhopes featured the portraits of famous people such as Paganini, Tourte and Stradivari.〔 The sectioned lens could magnify the microphotograph three hundred times,〔 so that the viewing of the microphotographs no longer required a bulky and expensive microscope. The modified Stanhope lens was small enough to be mounted in all manner of miniature artifacts such as rings, ivory miniatures, wooden toys etc.〔 Dagron also designed a special microphotographic camera which could produce 450 exposures approximately on a wet collodion plate.〔(George Eastman House )〕 Dagron's efforts met with great success.〔〔''(Encyclopedia of Nineteenth-century Photography )'' By John Hannavy Publisher 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Stanhope (optical bijou)」の詳細全文を読む スポンサード リンク
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