41
/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
May 31, 2026
310661
26490
2
Public Timelines
FAQ

aug 18, 1774 - Joseph Priestley Heated mercuric oxide and described observations as "dephlogisticated air" Observations built a foundation for the discovery of oxygen

Added to timeline:

19 Nov 2017
0
0
429

Date:

aug 18, 1774
Now
~ 252 years ago

Images: