41. Hermann Von Helmholtz And The Psychophysics Of Perception essay the science of music hermann von helmholtz and the psychophysics ofperception by brook stowe. Koenigsberger, Leo. hermann von helmholtz. http://www.theater2k.com/HermEssay.html

essay "the science of music: hermann von helmholtz and the psychophysics of perception" by brook stowe This essay on the work of 19th-Century German physician, physicist and philosopher Hermann von Helmholtz is the culmination of a compressed yet nevertheless wide-ranging exploration of the man and his work which began as a search for understanding of Helmholtzian thermodynamics and evolved instead into an analysis of the scientist's work in acoustical research, and his early forays into the psychophysics of human perception. The intent of this essay is two-fold: to both trace the trajectory of Helmholtz's life and the scientific pursuits which lead him into early psychophysical sensory research, and to demonstrate an at least basic, passing knowledge of the physical theorems and processes that formed the basis of his work. It should be noted that, while Helmholtz did psychophysical experimentation in both vision and sound, the analysis here will be confined to an examination of the latter for reasons of clarity and space. Comprising the basis of this examination are the four texts of this month's reading, anchored by the hernia-inducing

42. Hermann Von Helmholtz & Sonya Kovalevskaya Anton Chekhov Related Essays. hermann von helmholtz and the Psychophysicsof Perception. Sonya Kovalevskaya and the Poetry of Mathematics. http://www.theater2k.com/ChekhovRelatedMain1.html

Anton Chekhov Related Essays Hermann Von Helmholtz and the Psychophysics of Perception Sonya Kovalevskaya and the Poetry of Mathematics ... chekhov

43. Modern History Sourcebook: Hermann Von Helmholtz: Ice And Glaciers, 1865 Back to Modern History Sourcebook. Modern History Sourcebook hermann Ludwig Ferdinandvon helmholtz Ice and Glaciers, 1865. Translation Edmund Atkinson. http://www.fordham.edu/halsall/mod/1865helmholtz-ice.html

Back to Modern History Sourcebook Modern History Sourcebook: Hermann Ludwig Ferdinand von Helmholtz: Ice and Glaciers, 1865 Translation: Edmund Atkinson Introductory Note Hermann Ludwig Ferdinand von Helmholtz was born at Potsdam, near Berlin, on August 31, 1821. His father was a man of high culture, a teacher in the gymnasium, whose influence ensured to his son the foundations of a broad general education. His mother was a descendant from William Penn, the English Quaker. Helmholtz early showed mathematical ability, and wished to devote his life to the study of physics; but practical considerations led him to take up medicine, and he became a surgeon in the Prussian army. He began the publication of original contributions to science in 1842, and for fifty-two years, till his death in 1894, he continued to produce in an unbroken stream. He held a succession of academic positions, teaching physiology at Konigsberg, Bonn, and Heidelberg, and for the last twenty-three years of his life filling the chair of physics at Berlin. The titles of his professorships, however, give a very inadequate idea of his range. His contributions to science cover medicine, physiology, optics, acoustics, mathematics, mechanics, and electricity. His interests in science and art came together in his work on esthetics, and he had a lively appreciation of painting, poetry, and music.

44. Deutsches Museum Bonn: WissensLandschaft | Hermann Von Helmholtz-Gemeinschaft De Translate this page Forschung in Selbstverwaltung hermann von helmholtz-Gemeinschaft DeutscherForschungszentren »Die hermann von helmholtz-Gemeinschaft Deutscher http://www.deutsches-museum-bonn.de/wissenslandschaft/hgf.html

Home Wissenslandschaft Forschung in Selbstverwaltung Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren verfolgt langfristige Forschungsziele des Staates in wissenschaftlicher Autonomie. Von hier kommen Exponate des Deutschen Museums Bonn. Hermann von Helmholtz-Gemeinschaft (HGF) Wissenschaftszentrum D-53175 Bonn Die Hermann von Helmholtz-Gemeinschaft ist nach dem Physiker Hermann von Helmholtz (1821-1894) benannt. In der Hermann von Helmholtz-Gemeinschaft sind 16 nationale Forschungszentren in Deutschland zusammengeschlossen. Die Forschungszentren verfolgen Technologieprojekte im Vorfeld industrieller Entwicklung sowie die Zusammenarbeit mit der Industrie. Die Forschungszentren arbeiten eng mit den Hochschulen zusammen. Suchen Sie nach Hermann von Helmholtz-Instituten [Home] Das Museum Kommentar ... Links http://www.deutsches-museum-bonn.de

45. Helmholtz, Hermann Ludwig Ferdinand Von Translate this page Selected works - helmholtz, hermann von. 1842. De fabrica systematis nervosi evertebratorum.Berlin Universität Berlin - helmholtz, hermann von. 1847. http://vlp.mpiwg-berlin.mpg.de/people/data/per87.html

Helmholtz, Hermann Ludwig Ferdinand von Potsdam, Brandenburg Berlin, Germany Degrees: Career: and Emil DuBois-Reymond ); with Carl Ludwig Imperial Physico-Technical Institution for research in the exact sciences and precision technology. Selected works: - Helmholtz, Hermann von. 1856-67. Handbuch der physiologischen Optik. Leipzig: Voss search the library or the technology database Sources Schmidt; Zusne; DSB Last modified: 11/11/2002 by mB

46. Lit22219 - TOC Translate this page Dohrn, Anton. 1871. Letter to hermann von helmholtz from 2 August 1871. Dohrn,Anton. 1871. Letter to hermann von helmholtz from 18 September 1871. http://vlp.mpiwg-berlin.mpg.de/library/data/lit22219.html

Books Journals Manuscripts Trade Catalogues ... About this Section Berlin-Brandenburgische Akademie der Wissenschaften, Archiv: Helmholtz Papers. Dohrn, Anton. 1871. [Letter to Hermann von Helmholtz from 2 August 1871]. 3 pages (Archive of the Berlin Brandenburgische Akademie der Wissenschaften (NL Helmholtz 112)) Dohrn, Anton. 1871. [Letter to Hermann von Helmholtz from 18 September 1871]. 3 pages (Archive of the Berlin Brandenburgische Akademie der Wissenschaften (NL Helmholtz 112)) Dohrn, Anton. 1871. [Letter to Hermann von Helmholtz from 28 September 1871]. 1 pages (Archive of the Berlin Brandenburgische Akademie der Wissenschaften (NL Helmholtz 112)) Dohrn, Anton. 1875. [Letter to Hermann von Helmholtz from 5 June 1875]. 4 pages (Archive of the Berlin Brandenburgische Akademie der Wissenschaften (NL Helmholtz 112)) ... Helmholtz, Hermann von. n. d. [Excerpts on Physiology, ca. 1850s]. 73 pages (Archive of the Berlin Brandenburgische Akademie der Wissenschaften (NL Helmholtz 551)) Last modified: 03/28/2003 by mB

47. Hermann Von Helmholtz And The Foundations Of Nineteenth-Century David Cahan, editor hermann von helmholtz and the Foundations of NineteenthCenturyScience California Studies in the History of Science, 10 http://www.ucpress.edu/books/pages/2795.html

Entire Site Books Journals E-Editions The Press David Cahan, editor Hermann von Helmholtz and the Foundations of Nineteenth-Century Science California Studies in the History of Science, 10 Publication Date: January 1994 Subjects: Science History Victorian History Rights: World Clothbound Available Now Description About the Editor DESCRIPTION (back to top) Hermann von Helmholtz (1821-1894) was a polymath of dazzling intellectual range and energy. Renowned for his co-discovery of the second law of thermodynamics and his invention of the ophthalmoscope, Helmholtz also made many other contributions to physiology, physical theory, philosophy of science and mathematics, and aesthetic thought. During the late nineteenth century, Helmholtz was revered as a scientist-sagemuch like Albert Einstein in this century. David Cahan has assembled an outstanding group of European and North American historians of science and philosophy for this intellectual biography of Helmholtz, the first ever to critically assess both his published and unpublished writings. It represents a significant contribution not only to Helmholtz scholarship but also to the history of nineteenth-century science and philosophy in general. ABOUT THE EDITOR (back to top) David Cahan is Associate Professor of History at the University of Nebraska, Lincoln, and author of

48. The Ophthalmoscope And Hermann Von Helmholtz The Ophthalmoscope and hermann von helmholtz In 1850, hermann von helmholtzinvented the ophthalmoscope and revolutionized ophthalmology. http://www.eyecareamerica.org/eyecare/museum/exhibits/online/ophthalmoscope.cfm

You are here:  EyeCare America Museum of Vision Exhibits On-line The Ophthalmoscope and Hermann von Helmholtz Tour the Collection Exhibits Educational Resources Historical Research ... Give to Collection The Ophthalmoscope and Hermann von Helmholtz Hermann von Helmholtz was born in 1821 in Pottsdam, Germany. He was one of the great scientific minds of the 19th century whose accomplishments were in both medicine and science. In 1850 Helmholtz prepared an experiment for his physiology students to demonstrate the law of conservation of energy. For the experiment Helmholtz constructed a crude instrument made of cardboard, glue and microscope glass plates. This device was the predecessor of the ophthalmoscope used today. Helmholtz had many great accomplishments other than the ophthalmoscope, including his mastery and definition of physiological optics, theory of heat and energy, theories of hearing and the phenomenon of color and accommodation. Helmholtz earned many significant awards for his work, including being awarded the addition of the suffix "von" to his name. This honor, which he received from Kaiser Wilhem I, is similar to that of being knighted and one that can be inherited by descendants. Special thanks for this exhibit go to Spencer E. Sherman, MD.

49. Hermann Von Helmholtz Translate this page hermann von helmholtz von Sven Gerritsen - helmholtz-Gymnasium in Bonn - informativeund anschaulich gestaltete, umfangreiche (aber zT unfertige) Webseiten zu http://www.dafkurse.de/lernwelt/menschen/helmholtz/helmholtz.htm

Hermann Ludwig Ferdinand von Helmholtz Leben geboren am 31. August 1821 in Potsdam als Sohn eines Gymnasial- Oberlehrers besucht von 1830 bis 1838 das Gymnasium in Potsdam 1838 - studiert Medizin am "Königlich Medizinisch-Chirurgischen Friedrich-Wilhelm-Institut" zu Berlin; erhält seine naturwissenschaftliche Grundausbildung bei dem Physiologen und Anatomen Johannes Müller und dem Physiker Gustav Magnus 1842 - promoviert zum Doktor der Medizin Dr. med 1842-46 - arbeitet als einfacher Chirurg an der "Charité", dann als Eskadron-Chirurg im "Königlichen Gardehusarenregiment" in Potsdam 1847 - hält in der Physikalischen Gesellschaft zu Berlin den Vortrag "Über die Erhaltung der Kraft"; beschreibt darin die Wärmeproduktion und Kontraktion des Muskels und führt diese auf physikalische und chemische Kräfte zurück 1848 - verlässt den Militärdienst und kehrt nach Berlin zurück 1848/49 - Lehrer für Anatomie an der Berliner Kunstakademie; arbeitete als Assistent Johannes Müllers in den anatomischen Sammlungen

50. Hermann Helmholtz Translate this page Dokumente zur Erfindung des Augenspiegels durch hermann von helmholtz im Jahre1850. hermann von helmholtz in Heidelberg (1858-1871) / Wolfgang U. Eckart http://www.ub.uni-heidelberg.de/helios/fachinfo/www/math/homo-heid/helmholtz.htm

Hermann Helmholtz Dozent in Heidelberg Helmholtz, Hermann Ludwig Ferdinand von (31.8.1821 - 8.9.1894) Lexika (Printausgaben) WWW-Informationen Print-Biographien Werk Bibliographien Lexika Bd. 9 (1996), S.881 Helmholtz, Hermann Ludwig Ferdinand von (seit 1882), Naturforscher, Heidelberg Bd. 2. 1803-1932. - 1986, S. 108-109 Helmholtz, Hermann Julius Ferdinand (seit 1883: von Helmholtz) 1858-1871 Med. Fak. Physiologie (1792-1859) Gymnasiallehrer 31. Aug. 1821 Potsdam 8. Sept. 1894 Charlottenburg (jetzt: Berlin-Charlottenburg) (ev.) V August Ferdinand Julius H. M Caroline Penne (1797-1854) H 26. Aug. 1849 Olga von Velten (1827-1859) H K 3 S, 2 T u.a. Richard Wilhelm Ferdinand H. (1852-1934) Eisenbahn-Ingenieur s. NDB 8 (1969) S. 501-502 Lb 1862 Prorektor H; 1865/66 Mitgl. des Engeren Senats H; 1860, 1865/66 Dekan der Med. Fak. H 1861 Hofrat; 1865 Geh. Rat III. Kl.; 1868 Geh. Rat II. Kl.; 1891 Geh. Reg.-Rat E Qu UAH A-219/PA; GLA Abt. 60, Fasz. 221; GLA Abt. 76, Fasz. 9939; Bf. UBH W L P Anmerkungen: Die korrekten Vornamen sind Hermann Ludwig Ferdinand. Top WWW-Informationen Hermann von Helmholtz in Heidelberg (1858-1871) / Wolfgang U. Eckart

51. Physikalisch-Technische Bundesanstalt (PTB) hermann von helmholtz , Braunschweig 1902/ Helmut Rechenberg http://www.ptb.de/de/blickpunkt/interviews/helmholtz.html

Physik ist... Homepage English Version Fragebogen ... Gesine Grosche Physik ist... Antworten zum Fragebogen von Hermann von Helmholtz (1821 – 1894)(Quellen: Leo Koenigsberger, "Hermann von Helmholtz", Braunschweig 1902/ Helmut Rechenberg, "Hermann von Helmholtz, Bilder seines Lebens und Wirkens", Weinheim, New York, Basel, Cambrigde, Tokyo 1994) Helmholtz konnte aus finanziellen Gründen nicht Physik studieren, empfand sich aber als "geborenen Physiker". 2. Wo haben Sie Physik studiert? 3. Haben Sie in der Schule ein physikalisches Experiment erlebt, das Sie besonders beeindruckt hat? Welches physikalische Experiment beeindruckt Sie? 4. Ihr physikalisches Aha-Erlebnis? "Das Gesetz der Erscheinungen finden, heisst sie begreifen." 5. Haben Sie einen Lieblingsversuch? Philosophie 8. Hatten Sie je einen Chemiebaukasten? 17. Beherrschen Sie ein Musikinstrument? Helmholtz spielte Klavier. "In Helgoland war ein Augenblick, in dem es mir wie eine Erleuchtung kam, als ich sah, daß die Energie zeitlich konstant war. Es war ziemlich spät in der Nacht. Ich rechnete es mühsam aus, und es stimmte. Da bin ich auf einen Felsen gestiegen und habe den Sonnenaufgang gesehen und war glücklich." 24. Verraten Sie drei Eckpunkte Ihrer Biographie?

52. Physikalisch-Technische Bundesanstalt (PTB) Questions answered by hermann von helmholtz (1821 – 1894)(Sources Leo Koenigsberger,“ hermann von helmholtz,” Braunschweig 1902/ Helmut Rechenberg http://www.ptb.de/en/blickpunkt/interviews/helmholtz.html

Physics is... Homepage Deutsche Version Questionnaire ... Gesine Grosche Physics is 1. What were your reasons for studying physics? 2. What university did you go to? 3. Did you know a physical experiment at school which particularly impressed you? What are the physical experiments which impress you? While his classmates were reading Cicero or Vergil, Helmholtz calculated under his school desk the radiation path through telescopes. 4. Your physical aha-experience? 5. Do you have a favourite experiment? All his life, Helmholtz was engaged in tests on sensations. 6. Are you also interested in a completely different speciality? Philosophy 8. Have you ever had a chemical kit? No, Helmholtz liked to play with building blocks. 17. Do you master a musical instrument? Helmholtz played the piano. 21. A good measurement is always carried out very carefully, almost ceremoniously. Is this ceremony comparable with a sacred rite? 24. Would you tell us three important events of your biography? 25. Do you think there are things which cannot be measured? In the affirmative, what? 28. Which physicist do you admire?

53. Hermann Von Helmholtz - Wikipedia hermann von helmholtz. Reference hermann von helmholtz and the foundations of Nineteenthcentury Science Los Angeles University of California Press, 1994. http://www.wikipedia.org/wiki/Hermann_von_Helmholtz

54. L'Encyclopédie De L'Agora: Hermann Von Helmholtz Translate this page Dossier hermann von helmholtz. Sciences et techniques, hermann von helmholtz,Biographie en résumé Physiologiste et physicien allemand. http://agora.qc.ca/mot.nsf/Dossiers/Hermann_von_Helmholtz

Accueil Index Catégories Dossiers ... Imprimer L'intégrale des Croquis laurentiens Redécouvrez les plus belles régions du Québec, Anticosti les Iles-de-la-Madeleine l'Ile-aux-Coudres , le Témiscamingue , la Montérégie , les Laurentides , la Côte-Sud à travers le regard enchanté du frère Marie-Victorin , homme de science, poète et artiste. La guerre sur Internet Une recension complète du conflit américano-irakien sur Internet. Des centaines d'hyperliens: l'opposition à la guerre Sciences et techniques Hermann von Helmholtz Biographie en résumé Physiologiste et physicien allemand. L'une des figures marquantes de la science allemande du milieu du XIXe siècle, Hermann-Ludwig-Ferdinand von Helmholtz s'illustra principalement dans les domaines de la médecine et de la psychologie. Son Traité d'optique physiologique transforma la compréhension du phénomène de la vision grâce l'intégration de l'étude des dimensions physiques et psychologiques de celle-ci. Il mit de l'avant l'idée d'un rôle important de la connaissance dans la perception. Helmholtz fournit également une explication du mécanisme de l'"accommodation" de l'oeil, inventa l'ophthalmoscope et le téléstéréoscope et réactualisa la théorie des trois couleurs exposée par Thomas Young en 1801. Il fut une source d'inspiration pour bien des savants allemands, parmi lesquels Heinrich Hertz, le découvreur des ondes radio, qui fut son étudiant. Source: Thoemmes Press Portrait Gallery (reproduction autorisée) Vie et oeuvre Il a été de 1843 à 1848 médecin militaire à Potsdam, puis s'est voué à l'enseignement et a successivement occupé les chaires de physiologie des universités de Koenigsberg (1849), de Bonn (1855), de Heidelberg (1858) et celle de physique de l'université de Berlin (1871). L'Académie des sciences de cette dernière ville lui a ouvert ses portes dès 1857; la Société royale de Londres lui a décerné en 1873 la médaille Copley et l'Académie des sciences de Paris, qui l'avait élu correspondant en 1870, lui a attribué en 1892 la place d'associé étranger devenue vacante par le décès de dom Pedro. L'empereur d'Allemagne l'a anobli en 1885.

55. Hermann von Helmholtz - Biografie Rasscass Translate this page hermann von helmholtz. hermann von helmholtz gilt als eines der letzten Universalgenies. Nachnamevon helmholtz, Vorname hermann, Geburtsdatum 1821-08-31, http://www.rasscass.com/templ/te_bio.php?PID=594&RID=1

56. Introductory Note. Hermann Von Helmholtz; Translated By Edmund Atkinson. 1909-14 Introductory Note. hermann von helmholtz; Translated by Edmund Atkinson. 190914. IntroductoryNote. hermann von helmholtz; Translated by Edmund Atkinson. http://www.bartleby.com/30/1002.html

Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia World Factbook Columbia Gazetteer American Heritage Coll. Dictionary Roget's Thesauri Roget's II: Thesaurus Roget's Int'l Thesaurus Quotations Bartlett's Quotations Columbia Quotations Simpson's Quotations English Usage Modern Usage American English Fowler's King's English Strunk's Style Mencken's Language Cambridge History The King James Bible Oxford Shakespeare Gray's Anatomy Farmer's Cookbook Post's Etiquette Bulfinch's Mythology Frazer's Golden Bough All Verse Anthologies Dickinson, E. Eliot, T.S. Frost, R. Hopkins, G.M. Keats, J. Lawrence, D.H. Masters, E.L. Sandburg, C. Sassoon, S. Whitman, W. Wordsworth, W. Yeats, W.B. All Nonfiction Harvard Classics American Essays Einstein's Relativity Grant, U.S. Roosevelt, T. Wells's History Presidential Inaugurals All Fiction Shelf of Fiction Ghost Stories Short Stories Shaw, G.B. Stein, G. Stevenson, R.L. Wells, H.G. Nonfiction Harvard Classics Scientific Papers PREVIOUS ... BIBLIOGRAPHIC RECORD Scientific Papers. The Harvard Classics.

57. Ice And Glaciers. Hermann Von Helmholtz; Translated By Edmund Atkinson. 1909-14. Ice and Glaciers. hermann von helmholtz; Translated by Edmund Atkinson. 190914.Scientific Papers. hermann von helmholtz; Translated by Edmund Atkinson. http://www.bartleby.com/30/13.html

Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia World Factbook Columbia Gazetteer American Heritage Coll. Dictionary Roget's Thesauri Roget's II: Thesaurus Roget's Int'l Thesaurus Quotations Bartlett's Quotations Columbia Quotations Simpson's Quotations English Usage Modern Usage American English Fowler's King's English Strunk's Style Mencken's Language Cambridge History The King James Bible Oxford Shakespeare Gray's Anatomy Farmer's Cookbook Post's Etiquette Bulfinch's Mythology Frazer's Golden Bough All Verse Anthologies Dickinson, E. Eliot, T.S. Frost, R. Hopkins, G.M. Keats, J. Lawrence, D.H. Masters, E.L. Sandburg, C. Sassoon, S. Whitman, W. Wordsworth, W. Yeats, W.B. All Nonfiction Harvard Classics American Essays Einstein's Relativity Grant, U.S. Roosevelt, T. Wells's History Presidential Inaugurals All Fiction Shelf of Fiction Ghost Stories Short Stories Shaw, G.B. Stein, G. Stevenson, R.L. Wells, H.G. Nonfiction Harvard Classics Scientific Papers PREVIOUS ... BIBLIOGRAPHIC RECORD Scientific Papers. The Harvard Classics.

58. Baron Hermann Ludwig Ferdinand Von Helmholtz - AnsMe.com Dictionary (define) 1. German physiologist and physicist (18211894) Synonyms helmholtz,hermann von helmholtz, hermann Ludwig Ferdinand von helmholtz. http://define.ansme.com/words/b/baron_hermann_ludwig_ferdinand_von_helmholtz.htm

Search: Web Sites Dictionary - Define Dictionary - Sounds Like Dictionary - Relations Dictionary - Rhymes Dictionary - Translate Sponsors Index Baron Alexander von H... Baron Clive Baron Clive of Plasse... Baron de la Brede et ... ... Baron Georges Cuvier Baron Hermann Ludwig ... Baron Hugh Caswall Tr... Baron Jean Baptiste J... Baron Karl Maria Frie... Baron Karl Wilhelm vo... ... Baron Munchausen Dictionary - Baron Hermann Ludwig Ferdinand von Helmholtz Show Definition Sounds Similar Relations Rhymes Translate Definition for Baron Hermann Ludwig Ferdinand von Helmholtz Baron Hermann Ludwig Ferdinand von Helmholtz (noun) German physiologist and physicist (1821-1894) Synonyms: Helmholtz Hermann von Helmholtz Hermann Ludwig Ferdinand von Helmholtz Source: WordNet ® 1.7, © 2001 Princeton University All other brands are property of their respective owners. Directory Dictionary AIM Smileys Contact Us

59. Helmholtz, Hermann Von (1821-94) A B C D E F G H I J K L M N O P Q R S T U V W X Y Z helmholtz, hermann von (182194) http://www.angelfire.com/on2/daviddarling/Helmholtz.htm

The Encyclopedia of Astrobiology, Astronomy, and Spaceflight about main latest news news archive ... Z Helmholtz, Hermann von (1821-94) The leading German physicist of his day and an early advocate of the idea of panspermia . In a public lecture delivered in 1871 he said: Who can say whether the comets and meteors . . . may not scatter germs of life wherever a new world has reached the stage in which it is a suitable dwelling place for organic beings? We might, perhaps, consider such life to be allied to ours, at least in germ, however different the form it might assume in adapting to its new dwelling place. Criticizing this hypothesis, which was put forward independently in the same year by William Thomson (Lord Kelvin), Frederick Zöllner argued that meteorites reach such high temperature on falling through the Earth's atmosphere that any organisms contained within them would be incinerated. In reply, Helmholtz pointed out that the interior of a meteorite would remain cool during its passage through the air and, in any case, organisms on the surface might be thrown free before the temperature became intolerable. See Arrhenius, Svante

60. Hermann Von Helmholtz Translate this page hermann von helmholtz. http://www.chemie.uni-bremen.de/stohrer/biograph/helmholt.htm

Hermann von Helmholtz

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