Hydrometers the History of.

[Saltbush Bill]

Anyone a little interested in history and old stuff might enjoy this.

[Bushman]

Interesting, I would have liked to see a demonstration of the two for comparison.

[BamaHawk]

That was really interesting and I'm not even a history buff. I never knew one of the main tools in my arsenal was created for the purpose of taxation. Somewhat ironic.

[Deplorable]

I should have known that the government was behind its invention as a way to lay a duty on spirits. Fuckers can't keep their hand out of your pockets. Lol

[Birrofilo]

It's interesting to note that the density of a liquid varies with its temperature.
This principle had already been exploited to make a thermometer, now known as Galilei thermometer, but presented after the death of Galilei by the Accademia del Cimento, in the XVII century, probably on an idea by Galilei himself.

https://en.wikipedia.org/wiki/Galileo_thermometer

[Birrofilo]

It appears that the ancient Romans had an instrument, the hydroscopium, which was very likely exactly an hydrometer, in the VI century.

Although we have the description of the famous test with which Archimedes demonstrated that a certain golden crown was not made entirely of gold, Archimedes did not make an actual instrument from the concept.

https://books.google.it/books?id=B-4HAA ... um&f=false