Template:Selected anniversaries/December 10: Difference between revisions

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||1868: The first traffic lights are installed, outside the Palace of Westminster in London. Resembling railway signals, they use semaphore arms and are illuminated at night by red and green gas lamps.
||1868: The first traffic lights are installed, outside the Palace of Westminster in London. Resembling railway signals, they use semaphore arms and are illuminated at night by red and green gas lamps.


||1874: Dr. Walter Guyton Cady (December 10, 1874 – December 9, 1974) was a noted American physicist and electrical engineer. He was a pioneer in piezoelectricity, and in 1921 developed the first quartz crystal oscillator. Pic: https://ieee-uffc.org/about-us/history/walter-guyton-cady-memorial-page/
||1874: Dr. Walter Guyton Cady born ... physicist and electrical engineer. He was a pioneer in piezoelectricity, and in 1921 developed the first quartz crystal oscillator. Pic: https://ieee-uffc.org/about-us/history/walter-guyton-cady-memorial-page/


||1896: Alfred Nobel dies ... chemist and engineer, invented Dynamite and founded the Nobel Prize.
||1896: Alfred Nobel dies ... chemist and engineer, invented Dynamite and founded the Nobel Prize.

Revision as of 18:50, 2 September 2018