| Date | Text | |
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30 Nov 1909
Hertzsprung–Russell diagram |
Hertzsprung–Russell diagram (astronomy) The Hertzsprung–Russell diagram is developed by Ejnar Hertzsprung and Henry Norris Russell. |
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30 Nov 1909
Albert Einstein |
Albert Einstein (chemistry) Albert Einstein and Marian Smoluchowski find the Einstein-Smoluchowski formula for the attenuation coefficient due to density fluctuations in a gas. |
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30 Nov 1909
Umetaro Suzuki |
Umetaro Suzuki (chemistry) Umetaro Suzuki isolates the first vitamin complex, aberic acid. |
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30 Nov 1909
Hoechst AG |
Hoechst AG (chemistry) Hoechst AG market Arsphenamine under the trade name Salvarsan, the first organic antisyphilitic, its properties having been discovered the previous fall by bacteriologist Sahachiro Hata during systematic testing in the laboratory of Paul Ehrlich; it rapidly becomes the world's most widely prescribed drug. |
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30 Nov 1909
Alfred North Whitehead |
Alfred North Whitehead (mathematics) Publication of the 1st volume of Principia Mathematica by Alfred North Whitehead and Bertrand Russell, one of the most important and seminal works in mathematical logic and philosophy. |
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30 Nov 1909
Econometrics |
Econometrics (mathematics) First known use of the term "Econometrics" (in cognate form), by Paweł Ciompa. |
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30 Nov 1909
German |
German (physics) German physicist Theodor Wulf climbs the Eiffel Tower with an electrometer and discovers the first evidence of cosmic rays. |
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30 Nov 1909
Hans Reissner |
Hans Reissner (physics) Hans Reissner and Gunnar Nordström define the Reissner-Nordström singularity; Hermann Weyl solves the special case for a point-body source. |
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30 Nov 1909
pneumonic plague |
pneumonic plague (physiology and medic) A form of pneumonic plague spreads through northeastern China, killing more than 40,000. |
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30 Nov 1909
Thomas Hunt Morgan |
Thomas Hunt Morgan (physiology and medic) Thomas Hunt Morgan discovers that genes are located on chromosomes. |
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30 Nov 1909
Chicago |
Chicago (physiology and medic) Chicago cardiologist James B. Herrick makes the first published identification of sickle cells in the blood of a patient suffering from anemia. |
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30 Nov 1909
Peyton Rous |
Peyton Rous (physiology and medic) Peyton Rous demonstrates that a malignant tumor can be transmitted by a virus (now known as the Rous sarcoma virus, a retrovirus). |
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30 Nov 1909
Hans Christian Jacobaeus |
Hans Christian Jacobaeus (physiology and medic) Hans Christian Jacobaeus of Sweden performs the first thoracoscopic diagnosis with a cystoscope. |
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30 Nov 1909
George Owen Squier |
George Owen Squier (technology) Lieutenant-Colonel Dr. George Owen Squier of the United States Army invents telephone carrier multiplexing. |
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30 Nov 1909
Delaware, Lackawanna and Western Railroad |
Delaware, Lackawanna and Western Railroad (technology) Completion of Delaware, Lackawanna and Western Railroad's Paulinskill Viaduct on its Lackawanna Cut-Off, the world's largest reinforced concrete structure at this time, built under the supervision of Lincoln Bush, its chief engineer. |
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