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Roland Eötvös: Commemorative Year László SZARKA Chair , Eötvös 100 Coordination Team

Roland Eötvös: Commemorative Year László SZARKA Chair , Eötvös 100 Coordination Team I nternational Conference on Precision Physics and Fundamental Physical Constants 10−14 June 2019, Tihany. EÖTVÖS Loránd: his Hungarian name Roland EÖTVÖS: his international author’s name.

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Roland Eötvös: Commemorative Year László SZARKA Chair , Eötvös 100 Coordination Team

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  1. Roland Eötvös: Commemorative Year László SZARKA Chair, Eötvös 100 Coordination Team InternationalConference on Precision Physics and Fundamental Physical Constants 10−14 June 2019, Tihany

  2. EÖTVÖS Loránd: hisHungarianname Roland EÖTVÖS: hisinternationalauthor’sname Family background and CV 2. Achievements: concepts and terms named after him 3. His torsion balance field survey on Balaton 4. Eötvös 100 Commemorative Year 5. A few 3D photosby Eötvös

  3. Familybackground and CV

  4. The Vásárosnaményi Baron Eötvös family (Bereg county, NE-Hungary) Great-great-grandfather: Miklós Eötvös (1716‒1783): General of theCavalry, Baronfrom 1786 Great-grandfather: Ignác Eötvös (1763‒1838): Doctor of Arts, Royal Majesty, Under-Sheriff Grandfather: Ignác Eötvös (1786‒1851): Doctor of Philosophy and Law, Treasurer Master, Vice-Chancellor Father: József Eötvös (1813‒1871): Lawyer, Writer, Ministerof Public Education and Religion, Presidentof theAcademy Mother: Ágnes Rosty (1821‒1913), Daughter of Albert Rosty (1779–1847) Unter-Sheriff in Békés Father: József Eötvös (1813‒1871) József Eötvös and Ágnes Rostymarriedin 1842 and had fourchildren: Ilona (1846‒1924), Jolán (1847‒1909), Loránd (1848‒1919), Mária (1851‒1928)

  5. Loránd wasbornin Buda, 27 July, 1848 „Ambitionand sense of duty, whichbindsnotonlyto a privilegednation, buttothewhole of mankind, werebornwithme. Tosatisfythesetwoaspirations, and tosatisfymyindividualindependence is my life goal; and atleastso far I'vefoundthat I canansweritthe most if I enter thescientificcareer.” Fromtheletter of Roland Eötvös tohisfather 28 March, 1866 József Eötvös withhisson Vasárnapi Újság (Sunday News), 1860

  6. Roland EÖTVÖS Loránd (1848−1919) 1858 (by Gusztáv Keleti) 1912 1905 1896 1912 Young professor Married in 1876 with Gizella Horváth (1853−1919) Daughters: Jolán (1877−1879), Rolanda (1878-1952), Ilona (1880−1945) Eötvös did not have any grandchildren 1919 Studentin Heidelberg

  7. 1850 1860 1870 1880 1890 1900 1910 1920 Roland Eötvös (1808-1919) • Piarists, Pest Mountaineering, 3D photography 42 summersinDolomites Law studies Heidelberg (and Königsberg) Professor in Budapest Member of Academy (CM then OM) President of Academy Rector Minister Math. Phys. Society President of touristorganizations Lab. Field WEP Geophysics CapillarityGravitation (and magnetism) Nominationsfor Nobel prize: 1850 1860 1870 1880 1890 1900 1910 1920

  8. 2. Achievements: concepts and termsnamedafterhim

  9. Scientificconcepts and termsnamedafter Roland Eötvös Capillarity (surfacetension of liquids): Weakequivalenceprinciple (inertial/gravitationalmassproportionality): Laboratoryand fieldinstrument: Geodesy: Gravitationon a rotatingplanet: Gravityand magnetism: Eötvös rule (Eötvöslaw) Eötvös constant Eötvös number Eötvös experiment (EPF orEötvös-typeexperiment) Eötvös parameter Eötvös torsion balance (Eötvös pendulum) Eötvös tensor Eötvös effect Eötvös correction Eötvös law of magnetism (the Poisson-Eötvös relationship)

  10. Gravitational force/surface tension Georgescu, Achard(2004): Eötvös published hisresults 50 yearsearlierthan Bond; thename „Bond number” is new (1978) k=2.1×10−7 J/(K·mol2/3) Eötvös constant Eötvös number Eötvös rule (Eötvöslaw) Eötvös tensor Eötvös effect Eötvös correction Eötvös experiment (EPF orEötvös-typeexperiment) Eötvös law of magnetism (the Poisson-Eötvös relationship) Eötvös torsion balance (Eötvös pendulum) Eötvös parameter

  11. 3. The firstfieldsurveybyusing torsion balance: the Balaton measurements

  12. History: 1891: thefirstfieldexperimentbyusingtheprime (laboratory version) Eötvös torsion balance(Ság hill) The field version of the torsion balancebecamereadyin 1898 (knownasthe „Balaton” balance) The frozen Balaton (in 1901 and 1903) offered an ideal test area Gradients of subsurfaceorigin „Deviatingforce” R of subsurfaceorigin The „Balaton” torsion balance ”…the gradients perpendicular to the axis of the Balaton and the deviatingforces parallel to the axis indicate a tectonic line in this direction” Eötvös (1908) „TwoHungarianscientists indanger of life”

  13. 4. Eötvös 100 Commemorative Year(more than 100 events through 2019,Hungary and abroad)

  14. Eötvös 100 Commemorative Day Budapest, 2019.04.08. Wreathlayingceremony Budapest, 2019.04.09. Budapest, 2019.04.09.: thanksgiving mess

  15. Eötvös 100 exhibitionatthe EGU 2019 inVienna (with3D stereoscopicphotosby Eötvös and the „doubled” torsion balance)

  16. Academy Assembly, 7 May, 2019 Modernity of Eötvös inscience and inpublic life by András Patkós Eötvös Loránd National Science Competition Final: Ság hill (Celldömölk, 11-12 May, 2019) Modern theoriesingravitation (MordehaiMilgrom) 13 May, 2019

  17. 5. A few 3D photosby Eötvös, digitallyconvertedontheoccasion of theCommemorativeYear Takethered-cyanglasseson(red: leftside)

  18. Digitallyconverted 3D anaglyphphoto by Eötvös Budapest Műegyetem rakpart appr. 1890 Conversion: Zsolt Regály Konkoly Observatory 2019

  19. Digitallyconverted 3D anaglyphphoto Fruska Gora, Titel, 1902 Conversion: Zsolt Regály Konkoly Observatory

  20. Digitallyconverted 3D anaglyphphoto Balaton (1901 or 1903) Conversion: Zsolt Regály Konkoly Observatory

  21. Digitallyconverted 3D anaglyphphoto Balaton (1901 or 1903) www.eotvos100.hu Conversion: Zsolt Regály Konkoly Observatory

  22. Digitallyconverted 3D anaglyphphoto Dolomites Conversion: Zsolt Regály Konkoly Observatory More 3D photos: www.eotvos100.hu

  23. Digitallyconverted 3D anaglyphphoto Dolomites Conversion: Zsolt Regály Konkoly Observatory More 3D photos: www.eotvos100.hu

  24. Baron Eötvös’ truths on gravitational force and surface tension will remain in a thousand years as true and valuable they are today, even when our actual concepts for the gravity and for the smallest parts of the matter would happen to be eliminated. ” Sándor Mikola, 1929 „So, finally, we must rest assured that science does not give the true explanation of natural phenomena, but only leads to the border where the elusive begins.” Eötvös, 1877

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