Template:Selected anniversaries/April 20: Difference between revisions

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||1745 – Philippe Pinel, French physician and psychiatrist (d. 1826)
||1745 – Philippe Pinel, French physician and psychiatrist (d. 1826)
File:Johann Friedrich Pfaff.jpg|link=Johann Friedrich Pfaff (nonfiction)|1808: Mathematician and crime-fighter [[Johann Friedrich Pfaff (nonfiction)|Johann Friedrich Pfaff]] publishes new theory of differential forms which quickly finds application in the detection and prevention of [[crimes against mathematical constants]].


||James David Forbes FRS FRSE FGS (b. 20 April 1809) was a Scottish physicist and glaciologist who worked extensively on the conduction of heat and seismology. He invented the seismometer.
||James David Forbes FRS FRSE FGS (b. 20 April 1809) was a Scottish physicist and glaciologist who worked extensively on the conduction of heat and seismology. He invented the seismometer.

Revision as of 13:04, 22 November 2017