Giovanni Francesco Sagredo (1571 – 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. [1] He added a scale to Galileo's thermoscope to enable the quantitative measurement of temperature,[2] and produced more convenient portable thermometers.[3] Sagredo also discussed with Galileo the possibility of a telescope using a mirror.[4]. 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.[1]
References
- ^ a b Dialogue Concerning the Two Chief World Systems Galileo Galilei translated by Stillman Drake
- ^ J. E. Drinkwater (1832) Life of Galileo Galilei page 41
- ^ R. P. Benedict (1984) Fundamentals of Temperature, Pressure, and Flow Measurements, 3rd ed, ISBN 0-471-89383-8 page 4
- ^ Stargazer - By Fred Watson, Inc NetLibrary, Page 109
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