James Chadwick and the Alsos Digital Library for Nuclear Issues Today in History – February 27, 1932 – Chadwick publishes his discovery of the neutron. Until 1932, the atom was known to consist of a positively charged nucleus surrounded by enough negatively charged electrons to make the atom electrically neutral. Most of the atom was [...]
Entries Tagged as 'Earth Sciences'
February 27th, 2014 · Add a Comment
Engineering Education “Today in History” Blog: Foucault physically demonstrates that, yup, the Earth rotates!
January 6th, 2014 · Add a Comment
Today in History – January 6, 1851 - Foucault physically demonstrates the rotation of the Earth. Now this isn’t so easy to do because the earth rotates pretty slowly. How slowly? Well, it takes a full day to go around once, eh? So in a minute it’s going to rotate about, oh, 0.0007 revolutions. Not much. [...]
December 27th, 2013 · Add a Comment
Today in History – December 27, 1571 - Birth of Johannes Kepler. When Kepler made his calculations from measurements taken by Tycho Brahe and himself, at the turn of the seventeenth century, they had to create many of the instruments that they used. The types of tedious observations and measurements taken by Brahe and Kepler had [...]
November 25th, 2013 · Add a Comment
Today in History – November 25, 1867 - Alfred Nobel receives the patent for dynamite. While in Paris, Nobel came to work with Ascanio Sobrero, the inventor of nitroglycerine. Though it was ten times stronger that black powder, it was highly unstable. Nobel was intrigued with nitroglycerine’s potential as a construction tool. But he knew he [...]
September 5th, 2013 · Add a Comment
Today in History – September 5, 1977 – Voyager 1 is launched. A second spacecraft, the Voyager 2, was launched earlier on August 20, 1977 but Voyager 1 reached the outer solar system and interstellar space earlier due to its trajectory design for outer space and gravity-assist from Jupiter. Sharing Carl Sagan‘s belief that Earth [...]