Antique Ivy League Brown Harvard American Folk Art Flag Dresden Stamp Postcard For Sale
An antique postcard measuring approximately 3 1/2 x 5 1/2 inches. Thanks for looking.Dr. Walter Guyton Cady (December 10, 1874 – December 9, 1974) was a noted American physicist and electrical engineer. He was a pioneer in piezoelectricity, and in 1921 developed the first crystal oscillator.Cady was born in Providence, Rhode Island, graduated from Brown University in 1895, and studied 1897-1900 at the University of Berlin, receiving his Ph.D. in Physics in 1900. (From 1895-1897 he was also instructor in mathematics at Brown.) He was a Magnetic Observer from 1900-1902 with the Coast and Geodetic Survey, and from 1902-1946 he was a professor of physics at Wesleyan University, where his principal interests included electrical discharges in gases, piezoelectricity, ultrasound, piezoelectric resonators and oscillators, and crystal devices.Before World War I, Cady investigated arc discharges and radio detectors, but during the war became interested in crystals as he worked with General Electric Company's Research Laboratory, Columbia University, and the Naval Experimental Station in New London, Connecticut, on using high-frequency sound generated by piezoelectricity to detect submarines. His early experiments employed Rochelle salt crystals as transducers. After noticing that a quartz crystal connected to a variable-frequency electronic oscillator would vibrate strongly at a very specific frequency, but that at other frequencies it would not vibrate at all, he had the insight to apply crystal oscillators to radio frequency applications.In 1921 Cady designed the first circuit to control frequencies based on quartz crystal resonator, and received two fundamental patents on resonators and their applications to radio in 1923. Cady quickly realized that such circuits could be used as frequency standards, in 1922 published an IRE paper on this application, and in 1923 made the first direct international comparison of frequency standards by comparing his quartz resonators with frequency standards in Italy, France, England, and the United States. Cady was president of the Institute of Radio Engineers in 1932.During World War II, Cady again worked on military applications of piezoelectricity, including trainers for radar operators that used piezoelectric transducers in liquid tanks to generate realistic radar returns. He retired to Pasadena, California, in 1951, where he was a Research Associate at Caltech. He returned to Providence in 1963. After retirement he consulted for industry and the federal government.Cady held more than 50 patents, and was the inventor of the crystal-controlled oscillator, the highly selective narrow-band crystal filter, one of the principal theorists of the ferroelectricity in crystals, and a historian of the science of piezoelectric crystals. He won the 1928 IEEE Morris N. Liebmann Memorial Award, and in 1936 was the second American to receive the Duddell Medal and Prize of the Physical Society of London. He received honorary degrees from Brown University in 1938, and from Wesleyan in 1958. His papers are archived at the Smithsonian Institution and the Rhode Island Historical Society. Source:wikiHarvard has a fine collection of Hazeltine as detailed below: The papers of Harold D. Hazeltine (1871-1960), which were deposited in the Harvard Law School Library between 1955 and 1957, span the years 1898-1954. The papers consist exclusively of letters (correspondence) addressed to Hazeltine, accompanied by his detailed notes about each of the correspondents. These notes provide biographical and bibliographical data, the circumstances of Hazeltine's acquaintanceship with each individual, and the individual's contribution to and standing in the legal-academic world of the first half of the 20th Century. Hazeltine's correspondents were English, American, and Continental European legal scholars, historians, men of letters, members of the bench and bar, and a few English scholars in other fields such as economics and philosophy. Many of these letters and notes are of a social nature, such as invitations and thank-you notes. Most of Hazeltine's correspondents wrote in longhand, and few of even the most recent letters are typed.Series Series I. Correspondence from English Legal Series II. Correspondence from English Series III. Correspondence from English Men of Series IV. Correspondence from Members of the Bench and Bar of Series V. Correspondence from English Economists, Philosophers, Mathematicians, Classical Scholars, and Series VI. Correspondence from American Legal Series VII. Correspondence from American Series VIII. Correspondence from Continental Legal Series IX. Correspondence from Selected Information b. 18 November, Warren, educated Warren, PA, High School, Worcester Academy, Worcester, B.A. Brown LL.B. Harvard on board of Harvard Law in Europe: Universities of Berlin, Paris, London. In Berlin meets Otto Gierke, Heinrich Brunner, Bernhard Hübler, Franz von Liszt, Heinrich Dernburg, Josf Dr. juris utriusque, University of appointed to College Lectureship at University of Cambridge, elected a Fellow of Emmanuel College, Cambridge, and appointed to the University Readership relinquished by elected to Downing Professorship of the Laws of England Foundation of series of studies in English legal history under Hazeltine's general editorship (12 volumes were contribution to the " Cambridge Medieval History", the highlight of his Father dies, leaves no Hazeltine published many book reviews to supplement his Hon. LL.D. from Brown University and Harvard returns to Cambridge, gives set of letters from legal scholars, historians, etc. to Harvard Law School Library; all include his comments on the individual writers of the Litt. D., University of dies Bibliography of the published writings of H.D. Hazeltine in Proceedings of the British Academy, 1960 Title of Hazeltine's doctoral dissertation: "Englishes Mobiliaspfandrecht in Mittelalter"On Jan-01-13 at 02:07:56 PST, seller added the following information:
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Antique Ivy League Brown Harvard American Folk Art Flag Dresden Stamp Postcard: $200