What it is?

Barometer
Sextant
Astrolabe
A clock
This is the clock from the time of the Great French Revolution. During this time the French replaced various non-standard units in physics with the decimal metric system. The 24-hour division of the day was also abolished in favour of 20-hour, however, this regulation did not survive.
Katarzyna DÄ…browska
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Barometer
Sextant
Astrolabe
A clock
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flagPoland
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flagthe United Kingdom
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flagGermany
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flagFrance
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flagAustralia
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flagIndia
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flagthe United States
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flagCanada
21%
7%
50%
21%
14