hertz heinrich rudolf (16 Ergebnisse)

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8vo. Pages 414-448. [Entire volume: viii, 696 pp.] Tables. Quarter cloth, cloth tips, paste-paper over boards, gilt spine; rubbed. Ex library ms. paper spine label, rubber stamps. Very good. FIRST EDITION. As a student in Berlin, Heinrich Hertz noticed an announcement of a prize offered by the Berlin Philosophical Faculty for the solution of an experimental problem concerning electrical inertia. Helmholtz, who had proposed the problem and had great interest in its solution, provided Hertz with a room in his Physical Institute and directed him to literature on the problem. Hertz showed himself to be an extremely persistent and self-disciplined researcher; he spent hours pursing the problem. Hertz won the Philosophical Faculty prize in 1879, earning a medal, a first publication in Annalen der Physik in 1880, and Helmholtz' deepening respect. DSB, VI, p. 341.

8vo . xv, 278 pp. 40 figs., numerous formulae & charts, index. Modern full navy morocco, raised bands, gilt-stamped spine title, t.e.g. Fine. SECOND EDITION IN ENGLISH of Untersuchungen uber die Ausbreitung der elektrischen Kraft. "Hertz was the first to demonstrate experimentally that electromagnetic waves radiate in space at the speed of light, just as Maxwell had predicted in his Treatise on Electricity and Magnetism. Hertz determined that electromagnetic waves were longer than light waves and showed that they were in complete correspondence with the waves of light and heat in the transverse nature of their vibration and their susceptibility to reflection, refraction, and polarization." [Hook & Norman]. "Experimental proof by Hertz of the Faraday-Maxwell hypothesis that electrical waves and be projected through space was begun in 1887, eight years after Maxwell's death. The two main requirements were (a) a method of producing the waves, supposing that they existed, and (b) a method of detecting them once they were produced. Hertz found the first problem easy to solve. He used the oscillatory discharge of a condenser. Detection was much more difficult, because there then existed no means of detecting currents alternating at the high speed of these waves. Hertz in fact used an effect as old as the discovery of electricity itself-the electric spark. By inducing the waves to produce an electric spark at a distance, with no apparent connexion between the oscillator and the spark gap, and by moving the sparking apparatus so that the length of the spark varied, he proved beyond question the passage of electric waves through space." [PMM]. BM Readex Vol. 12, p. 71; DSB Vol. VI, pp. 340-50; Hook & Norman, Origins of cyberspace, 158; Printing and the mind of man, 377 (German 1st ed.).

8vo. Pages 421-448; 543-544; 983-1000. [Entire volume: viii, 1048 pp.] Figs. 23-29 on plate III; figs. 8-11 on plate VII. Quarter cloth, cloth corners, marbled boards, gilt spine; spine ends frayed, corners bumped. Ex library ms. paper spine label, rubber stamps. Very good. FIRST EDITION. HERTZ WAS THE FIRST TO DEMONSTRATE EXPERIMENTALLY THAT ELECTROMAGNETIC WAVES RADIATE IN SPACE AT THE SPEED OF LIGHT, just as Maxwell had predicted in his Treatise on electricity and magnetism. Hertz determined that electromagnetic waves were longer than light waves and showed that they were in complete correspondence with the waves of light and heat in the transverse nature of their vibration and their susceptibility to reflection, refraction, and polarization. "This discovery and its demonstration led directly to radio communication, television and radar." - Dibner. Barchas Collection 982; Dibner, Heralds of science, rev. ed., 71; DSB, VI, pp. 340-350; Haskell Norman Library 1060; Honeyman Sale 1667; Magie, Source book in physics, p. 549; Printing and the Mind of Man 377 (n); Sparrow, Milestones of Science 101n.

Leipzig, Johann Ambrosius Barth, 1889. Without wrappers as issued in "Annalen der Physik und Chemie. Hrsg. von G. Wiedemann.", Neue Folge Bd. 36, 4. Heft. Pp.669-936 a. 2 folded plates. (Entire issue offered). Hertz's paper: pp. 669-783. The last leaves loose. This importent was first published in "Sitzungsberichte" and describes how he proved by experiments that light is electromagnetic waves.

Leipzig, Johann Ambrosius Barth, 1889. Without wrappers as issued in "Annalen der Physik und Chemie. Hrsg. von G. Wiedemann.", Neue Folge Bd. 36, 1. Heft. Pp.1-272 a. 2 folded plates. (Entire issue offered). Hertz's paper: pp. 1-22. The first leaves loose. First appearance of an importent paper as it is a continuation of his groundbreaking paper "Ueber sehr schnelle electrische Schwingungen", 1887.

Leipzig, Johann Ambrosius Barth, 1880. Without wrappers as issued in "Annalen der Physik und Chemie. Hrsg. von G. Wiedemann.", Neue Folge Bd. 41, 11. Heft. Pp. 369-640 (entire issue offered, Heft 11). Hertz's paper: pp. 369-399. cLEAN AND FINE. First edition of this importent paper in which Hertz went beyond Maxwell and hereby took the first step on the way to RELATIVITY THEORY.In his second theoretical paper (the paper offered), Hertz applied Maxwell?s equations to moving, deformable bodies. Maxwell had not treated this problem systematically in the Treatise although, unknown to Hertz, he had done so elsewhere. Hertz recognized that to develop an electrodynamics of moving bodies, it was first necessary to specify whether or not the ether moves with bodies. For his part he would assume that the ether is mechanically dragged by moving bodies. The first ground for this assumption was that within the restricted domain of electromagnetic phenomena there was nothing incompatible with the idea of a dragged ether. The second ground was that its denial entailed the complication that two sets of electric and magnetic vectors had to be assigned to each point of space, one for the ether and one for the independently moving body. He recognized at the same time that a dragged ether was an unsure foundation for electrodynamics."(DSB).Schilpp "Einstein" pp. 31 ff. - Whittaker "A History of the Theories of Aether and Electricity", pp. 328 ff.

Leipzig, Johann Ambrosius Barth, 1888. Conemp. hcalf. 5 raised bands, gilt spine and gilt lettering to spine. A few scratches to spine. Small stamp on verso of first -and general- titlepage and small stamps to verso of plates. "Annalen der Physik und Chemie. Hrsg. von G. Wiedemann.", Neue Folge Bd. 34, VIII,1048 pp. a. 8 folded engraved plates. (Entire volume offered). Hertz' papers: pp. 155-170, pp. 273-285, pp. 551-569, pp. 609-623. First appearance of 4 famous and importent papers (2 of them in their final form) in which Hertz established by experiments the similarities between electric waves and light waves."Hertz followed up his determination of the finite velocity of electric waves by performing a series of more qualitative experiments in 1888 on the analogy between electric and light waves. Passing electric waves through huge prisms of hard pitch, he showed that they refract exactly as light waves do. He polarized electric waves by directing them through a grating of parallel wires, and he diffracted them by interrupting them with a screen with a hole in it. He reflected them from the walls of the room, obtaining interference between the original and the reflected waves. He focused them with huge concave mirrors, casting electric shadows with conducting obstacles. The experiments with mirrors especially attracted attention, as they were the most direct disproof of action at a distance in electrodynamics. They and the experiments on the finite velocity of propagation brought about a rapid conversion of European physicists from the viewpoint of instantaneous action at a distance in electrodynamics to Maxwell?s view that electromagnetic processes take place in dielectrics and that an electromagnetic ether subsumes the functions of the older luminiferous ether." (DSB)-.

Leipzig, Johann Ambrosius Barth, 1887. Without wrappers as issued in "Annalen der Physik und Chemie. Hrsg. von G. Wiedemann.", Neue Folge Bd. 31, 7. Heft. With the titlepage to vol. 31. Pp. 337-544 a. 2 folded plates, (entire issue offered "Heft" 7). Hertz's paper: pp. 421-448 A. PP. 543-544. A Stamp on titlepage and verso of. Clean and fine. First edition of Hertz's seminal paper on electromagnetic waves in which he empirically demonstrates Maxwell's equations. This discovery and its demonstration led directly to the invention radio of communication, television and Radar. The paper is the "ANNOUNCEMENT OF THE DISCOVERY OF THE PRODUCTION BY ELECTRICAL DISCHARGE OF WAVES WHICH HAVE THE PROPERTY OF VERY LONG WAVES"(H.M. Evans).Hertz demonstrates what Maxwell had predicted that electromagnetic waves radiated in space with the speed of light. Hertz determined these waves to be of greater length than light and that they could be reflected."Experimental proof by Hertz of the Faraday-Maxwell hypothesis that electrical waves can be projected through space was begun in 1887, eight years after Maxwell's death. The two main requirements were (a) a method of producing the waves, supposing that they existed, and (b) a method of detecting them once they were produced." (PMM, 377.). In the present paper Hertz "describes the apparatus that he had devised for the detection and measurement of electromagnetic waves, the key to his later success. To prove that electromagnetic waves can be projected through space it was necessary to devise a means of both producing the waves and, more difficult at the time, of detecting them once produced." (Norman Library, No. 1123)."Hertz's researches on electrical waves vindicated the Helmholtz ideal of the physicist as one whose competences embraced both experiment and mathematics. Hertz entered physics at the right time for one of his abilities to make a critical contribution" because the outstanding problem of physics was the disorderly condition of electrodynamics, what was needed was someone with the theoretical power to analyze the competing theories and with the experimental judgment to produce the evidence that would persuade the physical community that a decision between the theories had been reached." (DSB, VI, 348b.)"In the early 1890's the young inventor Guglielmo Marconi read of Hertz's electric wave experiments in an Italian electrical journal and began considering the Possibility of communication by wireless waves. Hertz's work initiated a technological development as momentous as it physical counterpart." (DSB, VI, 349a.).