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"BRAUN, FERDINAND. - THE DISCOVERY OF SEMICONDUCTOR RECTIFIER EFFECT.
Reference : 49327
(1874)
Ueber die Stromleitung durch Schwefelmetalle.
Leipzig, Johann Ambrosius Barth, 1874. 8vo. Contemp. 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. In: ""Annalen der Physik und Chemie. Hrsg. von J.C. Poggendorff"", Sechste Reihe Bd. 3, (= Poggendorff Bd. 153). X,636 pp., 4 plates. (Entire volume offered). Braun's paper: pp. 556-563.
First printing of Brown's importent paper in which he described his discovery of a semiconductor diode, noting that electrical currents flows freely in only one direction at the contact between a metal point and a galena crystal.""In 1874 Braun published the results of his research on mineral metal sulfides. He found that these crystals conducted electric currents in only one direction. This information was important in electrical research and in measuring another property of substances, the electrical conductivity, but Braun’s discovery did not have immediate practical application. In the early twentieth century the principle that Braun had discovered was employed in crystal radio receivers.""(DSB).The Nobel Prize in Physics 1909 was awarded jointly to Guglielmo Marconi and Karl Ferdinand Braun ""in recognition of their contributions to the development of wireless telegraphy"".
BRAUN, FERDINAND. - THE INVENTION OF THE CATHODE-RAY INDICATOR TUBE - SEEING BY ELECTRICITY.
Reference : 43448
(1897)
Ueber ein Verfahren zur Demonstration und zum Studium des zeitlichen Verlaufes variabler Ströme" (On a Method for the demonstration and study of currents varying with time).
Leipzig, Johann Ambrosius Barth, 1897. No wrappers. In ""Annalen der Physik und Chemie, Neue Folge"", Bd. 60, No 3. Pp. 401-576, textillustr. and 2 folded plates. (the entire issue offered, ""Heft 3""). Braun's paper: pp. 552-559 a. 6 textillustrations (showing the Braun tube and its operations). Clean and fine.
First printing of this groundbreaking paper being the first description of the principles governing the ""BRAUN TUBE"", which moves the elctron beams of alternating voltage, the principle on which ALL TELEVISON TUBES operate. - Braun shared the Nobel Prize for 1909 with Marconi ""in recognition of their contributions to the development of wireless telegraphy"".""Cold cathode tube with side anode, annular diaphragm to control spot size, and built-in fluorescent screen. Beam deflection by one external coil with the trace viewed indirectly in a rotating mirror, or by two coils at right angles for direct viewing. Excitation by hand-drive influence machine (friction generator) or by an induction coil. This ""indicator tube"", which enabled Braun to demonstrate how a variety of periodic and transient electrical phenomena could be visually examined, is the ancestor of electric oscilloscopes, televison picture tubes, and other electron-beam display devices.""( Shiers & Shiers ""Early Televison. A Bibliography to 1940"", No. 263).""The first oscilloscope, or Braun tube, was introduced in 1897. In order to study high-frequency alternating currents Braun used the alternating voltageto move the electron beam within the cathode tube. The trace on the face of the cathode tube represented the amplitude and frequency of the alternating-current voltage. He then produced a graph of this trace by use of a rotating mirror. The Braun tube was a valuable laboratory instrument, and modifications of it are a basic devise in electronic testing and research. The principle of the Braun tube, moving a electron beam by means of alternating voltage, is the principle on which all televison operate.""(DSB II, pp. 427-428).In 1909 he shared the Nobel Prize for physics with Guglielmo Marconi for their development of wireless telegraphy.
La Démonologie des hébreux tirée de l’ancien testament et des apocryphes.
Strasbourg, Silbermann, 1837, gd in-4 de 2-5 pp, cartonnage gris papier gaufré.
Thèse soutenue le 21 décembre 1837 pour obtenir le grade de bachelier en théologie. Tirage à petit nombre.
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