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"LORENZ, L. (LUDWIG VALENTIN) - LIGHT IS IDENTICAL WITH ELECTROMECANICAL WAVES.
Reference : 55371
(1867)
Om Identiteten af Lyssvingninger og elektriske Stømme. (On the Identity of the Vibrations of Light with electrical Currents).
(København, 1867). Contemp. marbled clothbacked boards. Titlelabel with gilt lettering on upper cover. Pp. 26-45. Extracted from ""Oversigt over det Kgl. danskeVidenskabernes Selskabs Forhandlinger 1867, Nr. 1"".
Extremely scarce first edition of the paper in which Lorenz, independent of Maxwell, stated that light is electromechanical in nature, probably inspired by his former teacher H. C. Oersted, the discoverer of electromagnetism and professor at the Polytechnic College, he aimed at unifying the forces of nature without introducing new physical hypotheses. ""The idea that the various forces in nature are merely different manifestations of the one and same force has proved itself more fertile than all physical theories"".Most impressive of all Lorenz’ achievements in optics is his electromagnetic theory of light, developed in a relatively unknown paper of 1867, two years after Maxwell’s famous paper on the same subject. At that time Lorenz did not know Maxwell’s theory, and his own approach was quite different. Lorenz’ electromagnetic theory of light can be described briefly as an interpretation of the light vector as the current density vector in a medium obeying Ohm’s law. This paper contains the fundamental equations for the vector potential and the scalar potential or - for the first time - the corresponding retarded potentials expressed in terms of the current density vector and the electrical charge density. The concept of retarded potentials had already been introduced in an earlier paper by Lorenz in connection with research on the theory of elasticity. He found that the differential equation for the current density vector was the same as his fundamental wave equation for the light vector, completed with a term which explains the absorption of light in conducting media, and that his theory led to the correct value for the velocity of light."" (Mogens Pihl in DSB).The paper was published in English, 1867 ""On the identity of the vibrations of light with electrical currents."" (Philosophical Magazine 34: 287-301) and also in German in ""Annalen der Physik""
Læren om Lyset. Forelæsninger for Officerskolens ældste Klasse.
Copenhagen, Reitzel, 1876. Cont. hcloth. Small nicks to spine ends. (4),190 pp., textdiagrams and illustrations.
First edition of Lorenz' early textbook in optics (The Theory of Light). His later remarquable result of his optical reseaches on the basis of his fundamental wave-equation was the well-known formula for the refraction constant R, known as the Lorentz-Lorenz-formula.
Læren om Lyset. Forelæsninger for Officerskolens ældste Klasse. (+) Læren om Varmen. Forelæsninger for Officerskolens ældste Klasse.
Copenhagen, Reitzel, 1876. Et samtidigt hldrbd. Rygforgyldning. Forgyldt rygtitel. Stempel på titelblade.(4),190 + (4),198 pp. Tekstillustrationer.
First edition of Lorenz' early textbook in optics (The Theory of Light). His later remarquable result of his optical reseaches on the basis of his fundamental wave-equation was the well-known formula for the refraction constant R, known as the Lorentz-Lorenz-formula.
"LORENTZ, H.A. & L. (LUDWIG VALENTIN) LORENZ - THE ""LORENZ-LORENTZ EQUATION""
Reference : 43412
(1880)
Ueber die Beziehung zwischen der Fortpflanzungsgeschwindigkeit des Lichtes und der Körperdichte" Von H.A. Lorentz. (+) Ueber die Refractionsconstante" von L. Lorenz. (2 Papers).
Leipzig, Johann Ambrosius Barth, 1880. Without wrappers as issued in ""Annalen der Physik und Chemie. Hrsg.von G. Wiedemann."", Neue Folge Band IX, Heft 4. Titlepage to Bd. 9. Pp. 513-680 a. 1 folded engraved plate. + Neue Folge Band XI, Heft 9. Titlepage to Bd. 11. Pp. 1-176 a. 2 folded plates. Lorentz's paper"" pp. 641-665 (of Heft 4). Lorenz's paper: pp. 70-103. (2 entire issues offered). A stamp on titlepapges and verso. Both clean and fine.
First printing of these two fundamental papers, revealing a lasting result in the history of physics, as both authors INDEPENDENTLY OF EACH OTHER, discovered the mathematical formula for the dependence of refraction of light upon specific gravity. It is very interesting that they found the formula - now called the Lorenz-Lorentz Equation or Formula - with altogether different ways and methods. They both discovered the formula before 1880, L.V. Lorenz first, but, also independently, published their final versions in the same periodical, and in the same year (the 2 papers offered). - Parkinson ""Breakthroughs"" 1880 P.
