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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Very interesting!
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Answers by country

Barometer
Sextant
Astrolabe
A clock
answers
flagRepublic of Ireland
0%
7%
23%
69%
13
flagSwitzerland
0%
16%
25%
58%
12
flagTurkey
8%
0%
33%
58%
12
flagPoland
6%
14%
21%
57%
12592
flagAustria
0%
20%
24%
56%
25
flagGermany
5%
17%
19%
55%
171
flagGreece
33%
0%
11%
55%
18
flagthe United Kingdom
6%
15%
23%
54%
94
flagFrance
7%
11%
34%
46%
26
flagItaly
8%
8%
41%
41%
12
flagthe Netherlands
30%
10%
20%
40%
10
flagAustralia
26%
0%
34%
39%
23
flagCanada
21%
4%
34%
39%
23
flagIndia
12%
20%
30%
36%
50
flagthe United States
19%
16%
27%
32%
162