When did equal temperament start being used?

Related questions

1. What was The Well Tempered Clavier?
2. When was Prelude in C Major written?
3. What composer wrote the most music?
4. Do grooms walk down the aisle to music?
5. What inspired Wordsworth to write the Prelude?
6. How old was Chopin when he wrote Nocturne?
7. How did Johann Sebastian Bach get started in music?
8. Does the bride walk down the aisle to a different song?
9. Was Bach famous during his lifetime?
10. What is unequal temperament?

Tags

1. #france
2. #germany
3. #temperament
4. #before
5. #various
6. #system
7. #equal
8. #widely
9. #tuning
10. #widespread
11. #adjustments
12. #tuners
13. #adopted
14. #organ
15. #harpsichordists
16. #england
17. #degrees
18. #matter
19. #small
20. #approximated
21. #century
22. #practical