Template:Selected anniversaries/July 30: Difference between revisions

Revision as of 11:59, 5 April 2018

1832: Chemist, physician, agronomist, industrialist, statesman, educator, and philanthropist Jean-Antoine-Claude Chaptal dies.
1841: Mathematician and astronomer George Biddell Airy measures mean density of the Earth using Gnomon algorithm technique. This data will later be adapted for use in detecting and preventing crimes against mathematical constants.
1864: American Civil War: Battle of the Crater: Union forces attempt to break Confederate lines at Petersburg, Virginia by exploding a large bomb under their trenches.
1972: "Hello World" computer program from 1974 proud to represent "Hello World" computer programs everywhere.
1974: Watergate scandal: U.S. President Richard Nixon releases subpoenaed White House recordings after being ordered to do so by the Supreme Court of the United States.

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 File:George Biddell Airy 1891.jpg|link=George Biddell Airy (nonfiction)|1841: Mathematician and astronomer [[George Biddell Airy (nonfiction)|George Biddell Airy]] measures mean density of the Earth using [[Gnomon algorithm]] technique. This data will later be adapted for use in detecting and preventing [[crimes against mathematical constants]].
+||Jacob Perkins (d. 30 July 1849) was an American inventor, mechanical engineer and physicist. Born in Newburyport, Massachusetts, Perkins was apprenticed to a goldsmith. He soon made himself known with a variety of useful mechanical inventions and eventually had twenty-one American and nineteen English patents. He is known as the father of the refrigerator. Pic.
 File:Petersburg crater aftermath 1865.jpg|link=Battle of the Crater (nonfiction)|1864: American Civil War: [[Battle of the Crater (nonfiction)|Battle of the Crater]]: Union forces attempt to break Confederate lines at Petersburg, Virginia by exploding a large bomb under their trenches.