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. He added a scale to Galileo's thermoscope to enable the quantitative measurement of temperature, and produced more convenient portable thermometers.

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  • 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. He added a scale to Galileo's thermoscope to enable the quantitative measurement of temperature, and produced more convenient portable thermometers. Sagredo also discussed with Galileo the possibility of a telescope using a mirror.. 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.
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  • 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. He added a scale to Galileo's thermoscope to enable the quantitative measurement of temperature, and produced more convenient portable thermometers.
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  • Giovanni Francesco Sagredo
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