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Achim Leistner is an Australian optician of German origin.〔Keats, Jonathon (27 September 2011). ("The Search for a More Perfect Kilogram" ). ''Wired''. Retrieved 16 June 2015.〕 He is the master optician of the Avogadro project, an international effort to define the Avogadro constant with maximum precision. He was asked to join the project from retirement as it was deemed that his expertise and craftsmanship were essential for the success of the project.〔Powell, Devin (1 July 2008). ("Roundest Objects in the World Created" ). ''New Scientist''. Retrieved 16 June 2015.〕 Leistner has made his career in the precision crafting of specialized optics. The Avogadro project needed a silicon sphere made to as high a precision as possible. The research team searched the world for manufacturing options and found Leistner's precision in handcrafting spheres superior to any machine. In addition to precision instruments, Leistner uses his hands to feel for irregularities in the roundness of the sphere.〔 The research team has called his extraordinary sense of touch "atomic feeling".〔("Precision: The Measure of All Things, Episode 2: Mass and Moles ). BBC Four. Television program aired 4 July 2014 in the United Kingdom.〕 Leistner is in his seventies and has not found an apprentice who can match his precision. Once he retires from the project, the Avogadro team hopes that machines will have advanced sufficiently to match Leistner's capabilities.〔 Leistner holds certificates in precision optics, geometrical optics, optical design drawing, and mathematics from Optic Carl Zeiss Jena Technical College. He has served as a member of the Australian Optical Society and on international conference working committees for SPIE and the Optical Society of America. ==See also== * List of Australians * List of physicists 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「Achim Leistner」の詳細全文を読む スポンサード リンク
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