Template:Selected anniversaries/January 11: Difference between revisions

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||Ferdinand Minding (b. January 11 1806) was a German-Russian mathematician known for his contributions to differential geometry. Minding considered questions of bending of surfaces and proved the invariance of geodesic curvature. He studied ruled surfaces, developable surfaces and surfaces of revolution and determined geodesics on the pseudosphere. Pic.
||Ferdinand Minding (b. January 11 1806) was a German-Russian mathematician known for his contributions to differential geometry. Minding considered questions of bending of surfaces and proved the invariance of geodesic curvature. He studied ruled surfaces, developable surfaces and surfaces of revolution and determined geodesics on the pseudosphere. Pic.


||Giuseppe Battaglini (b. 11 January 1826) was an Italian mathematician.
||1826: Giuseppe Battaglini born ... mathematician.


||1845 Albert Victor Bäcklund, Swedish mathematician and physicist (d. 1912)
||1845: Albert Victor Bäcklund born ... mathematician and physicist.


||Johannes Franz Hartmann (b. January 11, 1865) was a German physicist and astronomer. In 1904, while studying the spectroscopy of Delta Orionis he noticed that most of the spectrum had a shift, except the calcium lines, which he interpreted as indicating the presence of interstellar medium. Pic.
||1865: Johannes Franz Hartmann born ... physicist and astronomer. In 1904, while studying the spectroscopy of Delta Orionis he noticed that most of the spectrum had a shift, except the calcium lines, which he interpreted as indicating the presence of interstellar medium. Pic.


||1872 – G. W. Pierce, American physicist and academic (d. 1956)
||1872: George Washington Pierce dies ... inventor who was a pioneer in radiotelephony and a noted teacher of communication engineering. He did work that led to the practical application of a variety of experimental discoveries in piezoelectricity and magnetostriction. He developed the Pierce oscillator, which utilizes quartz crystal to keep radio transmissions precisely on the assigned frequency and to provide similar accuracy for frequency meters. His other accomplishments include the mathematical calculation of the radiation properties of radio antennae; invention of the mercury-vapor discharge tube, which was the forerunner of the thyratron; invention of a method of recording sound on film; and sound generation by bats and insects. Pic: https://web2.ph.utexas.edu/utphysicshistory/GeorgeWPierce.html


||1889 Calvin Bridges, American geneticist and academic (d. 1938)
||1889: Calvin Bridges born ... geneticist and academic.


||Laurens Hammond (b. January 11, 1895), was an American engineer and inventor. His inventions include, most famously, the Hammond organ, the Hammond clock, and the world's first polyphonic musical synthesizer, the Novachord. Pic.
||1895: Laurens Hammond born ... engineer and inventor. His inventions include, most famously, the Hammond organ, the Hammond clock, and the world's first polyphonic musical synthesizer, the Novachord. Pic.


||1906 – Albert Hofmann, Swiss chemist and academic, discoverer of LSD (d. 2008)
||1906 – Albert Hofmann, Swiss chemist and academic, discoverer of LSD (d. 2008)

Revision as of 11:44, 19 August 2018