Willy

Willy — marelibri

Die Wissenschaftlichen Grundlagen des Rundfunkempfangs

1927réf. 24331Berlin: Julius Springer 1927. First Edition. Cloth. Very Good. First Edition. viii 418 2-ads pages. 8vo. Publisher's blue/black boards with gilt lettering and publisher's device on spine and titles on front panel. Bookstore tag on front pastedown. Binding glued in gutter at Vorwort foreword. Otherwise a nice clean bright copy. Text in German. Cloth. Wagner was a full member of the Academy of Sciences Berlin and was made in 1931 an Honorary Member of the American Academy of Arts and Sciences Boston. He held numerous other awards including in 1930: Slaby-Plakette des Deutschen Funktechnischen Verbandes. In 1924 he founded the magazine Zeitschrift Elektrische Nachrichtentechnik. In the foreword Wagner notes that the sudden onset of broadcasting has created high demand for wireless telephony and has accelerated technical developments dramatically. The new building blocks of broadcasting can be built on the progress made in radio technology. In addition to the general relations of electrodynamics the laws of transmission propagation and reception of electric waves the events occurring in the electron tubes and their mode of action in the various circuits as rectifiers amplifiers and vibration exciters and finally the laws of acoustics and the operation of the electro-acoustic devices all play a role. Knowing all of these things is essential for building a good broadcast radio but is not easy to acquire because so far there has been no where to go for sound details regarding all of these issues. The Heinrich Hertz Society in 1925 created a plan to promote broadcasting over the airwaves by organizing a series of lectures about "The scientific basis of radio communications". This book was the much enlarged result. Wagner is probably best known for the development of what we now call wave filterswork he did starting in 1915. "The most prominent researchers G. A. Campbell in the United States and K. W. Wagner in Germany explored selective filter circuits for telephone applications in the early years of World War I thus paving the way for the first ideas about electrical circuit synthesis. They designed sophisticated filter circuits simply by cascading elementary sections of lossless inductors and capacitors. The circuits obtained in this way had a striking similarity to circuit models in engineering transmission line theory and henceforth were called ‘wave filters’." Life and Work of Wilhelm Cauer 1900 – 1945 Cauer et al Proc. MTNS2000 Perpignan France June 19 - 23 2000 Waveguide filters today are most useful in the microwave band of frequencies where they are a convenient size and have low loss. Examples of microwave filter use are found in satellite communications telephone networks and television broadcasting. Davis Electrical and Electronic Technologies #372 noting that in 1915 filter technology came into being with the independent proposal of it by Campbell and Wagner. Julius Springer unknown books

Kuenzig Books · États-Unis193,00 $US≈ 172,43 €

von Braun, Wernher; Fred L Whipple: Willy LeyABAA

Conquest of the Moon

1953réf. 140947434New York: The Viking Press 1953. First Edition. Very Good/Very Good. First edition first printing. Signed by Wernher von Braun on the title page. viii 126 pp. Bound in publisher's green cloth stamped in silver. Very Good with moderate wear and soiling to covers 1-3/4 inch tear to lower edge of contents page. Gift inscription dated 1984 to half-title page. Offsetting from two newspaper clippings taped to facing page likely indicating occasion of book's signing. In a Very Good unclipped dust jacket with moderate edgewear and toning. Dr. Wernher von Braun was a brilliant and visionary German engineer and onetime SS Stormbahnfuerer who led the V-2 ballistic missile program during the Second World War. He convinced his colleagues to surrender themselves and their materials to the Americans after the war ignoring orders to kill themselves rather than fall into enemy hands. The Americans knew a good thing when they saw it and smuggled 118 German scientists one hundred V-2s and tons of related components and documents out of the country. To Stalin's fury the Soviets were left only with lower-level rocket scientists to press into service hindering their performance in the Space Race years later. Once in the United States von Braun spent fifteen years working for the United States Army on ballistic weapons but his true passion was space travel. He once told a group of British journalists: "The V-2 was a fine rocket. The only thing wrong with it was that it landed on the wrong planet." Frustrated with being sidelined von Braun convinced Collier's associate editor Cornelius Ryan whom he met at a symposium on space medicine in San Antonio to run a series on space travel. The magazine series provided the material for The Conquest of the Moon published in 1953 by Viking. Neil Armstrong read the book when he returned from his tour of duty in Korea and it influenced his decision to become an astronaut. Von Braun's work co-written with popular science writers and beautifully illustrated by Chesley Bonestell inspired the U.S. government as well. In 1960 President Eisenhower transferred von Braun's rocket development group from the Army to the newly established National Aeronautics and Space Administration NASA separating space science from military science for the first time. Von Braun became the director of the Marshall Space Flight Center and was in charge of developing the Saturn space boosters used as the launch vehicles for the Apollo Moon program. His work was essential in the competition with the Soviet Union and the former Nazi was lauded as a national hero. The Viking Press unknown books

Burnside Rare Books, ABAA · États-Unis4 800,00 $US≈ 4 288,40 €

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