Hermann von HelmholtzClarendon Press, 1906 - 440 pages |
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Common terms and phrases
able Academy acoustics action after-images already alteration anatomy apparatus appeared artist axioms Berlin bodies Bois Bois-Reymond Bonn Brücke chemical colours combination tones conception conclusions conductors connexion Conservation of Energy corresponding determined discovery distance electrical currents electrodynamic electromotive electromotive force equations excitation experimental experiments expressed external fact father fluid forces friends fundamental galvanometer gave geometry give given heat Heidelberg Helmholtz Hertz hypothesis ideas illumination important interesting investigations Johannes Müller Kirchhoff knowledge Königsberg later lecture light Lord Kelvin Ludwig magnetic magnitude mathematical measure mechanical ments method motion muscle natural science nerve object observations ophthalmoscope over-tones particles perception phenomena philosophical physical physicists Physiological Optics ponderable Pontresina position possible potential Potsdam principle problems processes produced Professor published question rays regard relations retina rotation scientific sensations space spectrum surface theorem theory theory of colour Thomson tion velocity vibrations vis viva viva wife writes
Popular passages
Page 41 - be either attractive or repulsive. ' Finally, therefore, we discover the problem of physical natural science to be, to refer natural phenomena back to unchangeable attractive and repulsive forces, whose intensity depends solely upon distance. The solvability of this problem is the condition of the complete comprehensibility of nature.
Page 221 - by a long string of questions, which he shies at. How his students understand him, without keeping him as strictly to the subject as I ventured to do, is a puzzle to me ; still, there were numbers of students in the laboratory, hard at work, and apparently quite understanding what they were about.
Page 145 - for his wife's health. She appeared for a short time in the evening, and is a charming and intellectual lady, but in very bad health. He far exceeds all the great men of science with whom I have made personal acquaintance, in intelligence and lucidity and mobility of thought, so that I felt quite wooden beside him sometimes.
Page 42 - of things, must bring her notions into harmony with the expressed requirements as to the nature of simple forces, and with the consequences which flow from them. Her vocation will be ended as soon as the reduction of natural phenomena to simple forces is complete, and the proof given that this is the only reduction of which the phenomena are capable.
Page 205 - contingent on the caprice of the author, but develop according to their own laws, I often have the impression that it is not my own work that I am writing out, but some one else's. Mr. Thomson must have found the same thing in his own work on the mechanical theory of heat.
Page 213 - Your undertaking to write a Textbook of Natural Philosophy is very praiseworthy, but will be exceedingly tedious. At the same time I hope it will suggest ideas to you for much valuable work. It is in writing a book like that, that one best appreciates the gaps still left in science.
Page 155 - and who has principally concerned himself with the Theory of the Conservation of Energy in England. He is certainly one of the first mathematical physicists of the day, with powers of rapid invention such as I have seen in no other man.
Page 208 - Was vom Menschen nicht gewusst, Oder nicht bedacht, Durch das Labyrinth der Brust Wandelt in der Nacht.
Page 344 - in order to form a clear conception of the processes, and they must be allowed to do this after their fashion, since the whole extraordinarily comprehensive system of organic chemistry has developed in the most irrational manner, always linked with sensory images, which could not possibly be legitimate in the form in which they are represented.
Page 110 - Those were splendid moments. He is as simple, charming, and unaffected as a child ; I have never seen a man with such winning ways. He was, moreover, extremely kind, and showed me all there was to see. That, indeed, was little enough, for a few wires and some old bits of wood and iron seem to serve him for the greatest discoveries.