Quote:
Originally Posted by SIKSUKR
They didn't have thermometers in 1822 but I'm probably wrong and mid August would be more like it. 
Trying to find historical average lake temps.Help
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I've got a model of Galileo's "thermometer"—
invented in 1593. Not a mercury thermometer, I feared it might freeze and break in our unheated cottage last winter. It came through OK. It uses mineral spirits as a suspension medium. Some "Galileo thermometers" sold today don't recommend freezing temperatures.