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Giovanni Francesco Sagredo (1571– 5 March 1620) was a Venetian mathematician and close friend of Galileo, who wrote: ''Many years ago I was often to be found in the marvelous city of Venice, in discussions with Signore Giovanni Francesco Sagredo, a man of noble extraction and trenchant wit.'' 〔(Dialogue Concerning the Two Chief World Systems ) Galileo Galilei, translated by Stillman Drake〕 He was also a friend and correspondent of English scientist William Gilbert.〔S. P. Thompson (1903) ''The Geographical Journal'' vol 21 no 6, pp 611-618 "William Gilbert and Terrestrial Magnetism"〕 Sagredo added a scale to Galileo's thermoscope to enable the quantitative measurement of temperature,〔J. E. Drinkwater (1832) ''Life of Galileo Galilei'' page 41〕 and produced more convenient portable thermometers.〔R. P. Benedict (1984) Fundamentals of Temperature, Pressure, and Flow Measurements, 3rd ed, ISBN 0-471-89383-8 page 4〕 Sagredo also discussed with Galileo the possibility of a telescope using a mirror (a reflecting telescope).〔(Stargazer - By Fred Watson, Inc NetLibrary, Page 109 )〕 Galileo honoured him after his death by making him one of the characters in Dialogue Concerning the Two Chief World Systems discussing the Copernican and the Ptolemaic theories of astronomy.〔 In 1619, Galileo and Sagredo exchanged portraits.〔N. Wilding (2006) ''Galilaeana: Journal of Galilean Studies'' vol 3, pp.229 – 245 "Galileo’s Idol: Gianfrancesco Sagredo Unveiled"〕 There are two existing portraits, in the Zhytomyr Regional Museum〔〔''The Burlington Magazine'', Vol. 133, No. 1062 (Sep., 1991), p. 630 (book review)〕 and the Ashmolean Museum.〔 They are attributed to the brothers Leandro Bassano and Gerolamo Bassano.〔 Sagredo died 5 March 1620, leaving his possessions to his brother Zaccaria, who largely disposed of them: Sagredo's collection of letters has not been found.〔 Sagredo's letters to Gilbert were destroyed in the Great Fire of London.〔 ==References== 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「Giovanni Francesco Sagredo」の詳細全文を読む スポンサード リンク
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