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we are in the 20th centurey
Much like what women wear today..that is "clothes"...:)
Well. That's one I'd have to take a guess for.
According to her wikipedia article Ayrton died in the 20th century, specifically on 23 August 1923.
periscope.
drum
The instrument used to measure a angle is called a protractor!
15th centurey
Mass is measured using different types of balances.
A sundial
6th Centurey B.C
1 century = ~3,153,600,000 seconds.