 1733 - Richard Kirwan born: specific heats; defender of phlogiston eventually converted to antiphlogistic theories. |
| 1774 - Joseph Priestley first prepared oxygen. |
| 1817 - Joseph H. Gilbert born: nitrogen fertilizers. |
| 1885 - George de Hevesy born: radioisotopes; co-discoverer of halfnium (Hf, element 72); Nobel prize, 1943. |
| 1897 - Charles R. Harington born: biochemist; synthesized thyroxine with G. Barger. |
sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com
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