Loránd Eötvös

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Loránd Eötvös
Hermann Helmholtz[1]

torsion pendulum
.

In addition to Eötvös Loránd University[3] and the Eötvös Loránd Institute of Geophysics in Hungary, the Eötvös crater on the Moon,[4] the asteroid

12301 Eötvös and the mineral lorándite
also bear his name, as well as a peak (Cima Eotvos) in the Dolomites.

Life

Loránd Eötvös

Born in 1848, the year of the Hungarian revolution, Eötvös was the son of the Baron József Eötvös de Vásárosnamény (1813–1871), a well-known poet, writer, and liberal politician, who was cabinet minister at the time, and played an important part in 19th century Hungarian intellectual and political life. His mother was the Hungarian noble lady Agnes Rosty de Barkócz (1825–1913), member of the illustrious noble family Rosty de Barkócz [hu] that originally hailed from the Vas county, and through this, he descended from the ancient medieval Hungarian noble Perneszy family, which died out in the 18th century. Loránd's uncle was Pál Rosty de Barkócz (1830–1874) was a Hungarian nobleman, photographer, and explorer, who visited Texas, New Mexico, Mexico, Cuba and Venezuela between 1857 and 1859.

Portrait by Gustav Morelli (1889)

Loránd Eötvös first studied law, but soon switched to physics and went abroad to study in

capillarity
, then by his refined experimental methods and extensive field studies in gravity.

Eötvös is remembered today for his experimental work on

CGS unit for gravitational gradient is named the eotvos
in his honor.

From 1886 until his death, Loránd Eötvös researched and taught in the University of Budapest, which in 1950 was renamed after him (Eötvös Loránd University).

Eötvös is buried in the

Kerepesi Cemetery in Budapest, Hungary.[5]

Torsion balance

A variation of the earlier invention, the

gravitational mass accurately, as a response to the offer of a prize. This equivalence was used later by Albert Einstein in setting out the theory of general relativity
.

This is how Eötvös describes his balance:

It was just a simple, straight stick that I used as instrument, specially loaded at both ends, enclosed into a metal sheath to protect it from the wind and temperature changes. Upon this stick every single mass, be it near or far, exerts a directing force; but the wire upon which it hangs resists, and whilst resisting it twists, with the degree of this twist showing us the exact magnitude of the forces acting upon the stick. This is a Coulomb balance, and that is all there is to it. It is simple, like the flute of Hamlet, you only have to know how to play on it, and just like the musician who can delight you with splendid variations, the physicist can, on this balance, with no less delight determine the finest variations of gravity. This way we can peer into such depth of the crust of the Earth, that neither our eyes, nor our longest drills could reach.[6][7]

One of Eötvös' assistants who later became a noted scientist was Radó von Kövesligethy.

Honors

To honor Eötvös, a postage stamp was issued by Hungary on 1 July 1932.[8] Another stamp was issued on 27 July 1948 to commemorate the centenary of the birth of the physicist.[9] Hungary issued a postage stamp on 31 January 1991.[10]

See also

References

  1. ^ Physics Tree – Hermann von Helmholtz Family Tree
  2. ^ L. Bod, E. Fishbach, G. Marx, and Maria Náray-Ziegler: One hundred years of the Eötvös experiment, – Acta Physica Hungarica 69/3-4 (1991) 335–355
  3. ^ Brief History of ELTE, Eötvös Loránd University, archived from the original on 7 May 2016, retrieved 7 May 2016
  4. .
  5. ^ See this site for a photograph of his gravesite.
  6. ^ Ouellette, Jennifer (28 May 2014). "Free Fallin': Equivalence Holds Even At Atomic Level". Scientific American. Scientific American, a Division of Nature America, Inc. Retrieved 23 July 2022.
  7. ^ "Roland Eötvös". Magnet Academy. Retrieved 23 July 2022.
  8. ^ colnect.com/en/stamps/stamp/141647-Baron_Loránd_Eötvös_1848-1919_physicist-Personalities-Hungary.
  9. ^ colnect.com/en/stamps/stamp/179845-Baron_Lóránd_Eötvös_1848-1919_physicist-Lóránd_Eötvös-Hungary
  10. ^ colnect.com/en/stamps/stamp/181792-Lóránd_Eötvös-People-Hungary

Further reading

  • Antall, J. (1971), "The Pest School of Medicine and the health policy of the Centralists. On the centenary of the death of József Eötvös", Orvosi Hetilap, vol. 112, no. 19 (published 9 May 1971), pp. 1083–9,
    PMID 4932574

External links

Political offices
Preceded by
Minister of Religion and Education

1894–1895
Succeeded by
Cultural offices
Preceded by President of the Hungarian Academy of Sciences
1889–1905
Succeeded by