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William Herbert Rollins (June 19, 1852 - 1929) was an American scientist, inventor, and dentist. He was a pioneer in radiation protection.Many of his inventions and investigations in medical radiography and photography have been ranked in importance with those of Thomas A. Edison, Elihu Thomson, and William J. Morton.
Many inventions improved the quality of radio, and amateurs experimented with uses of radio, thus planting the first seeds of broadcasting. Telefunken The company Telefunken was founded on May 27, 1903, as "Telefunken society for wireless telefon" of Siemens & Halske (S & H) and the Allgemeine Elektrizitäts-Gesellschaft ( General Electricity ...
The timeline of radio lists within the history of radio, the technology and events that produced instruments that use radio waves and activities that people undertook. Later, the history is dominated by programming and contents, which is closer to general history .
Robley D. Evans made the first measurements of exhaled radon and radium excretion from a former dial painter in 1933. At MIT he gathered dependable body content measurements from 27 dial painters. This information was used in 1941 by the National Bureau of Standards to establish the tolerance level for radium of 0.1 μ Ci (3.7 k Bq ).
The Bellwether: Why Ohio Picks the President (Ohio University Press, 2016) Lamis, Alexander, and Brian Usher. Ohio Politics (2007) 544pp. Maizlish, Stephen E. The Triumph of Sectionalism: The Transformation of Ohio Politics, 1844–1856 (1983) Miller, Richard F. States at War, Volume 5: A Reference Guide for Ohio in the Civil War (2015).
1957 – Peter Scheuer publishes his P(D) method for obtaining source counts of spatially unresolved sources; 1959 – Radio Observatory of the University of Chile, located at Maipú, Chile founded; 1959 – The 3C catalogue of radio sources is published (revised in 1962) 1959 – The Shane 120-inch (3.0 m) Telescope Opened at Lick Observatory
Taking an X-ray image with early Crookes tube apparatus, late 1800s. Radiography's origins and fluoroscopy's origins can both be traced to 8 November 1895, when German physics professor Wilhelm Conrad Röntgen discovered the X-ray and noted that, while it could pass through human tissue, it could not pass through bone or metal. [1]
Isidor Isaac Rabi won the Nobel Prize in Physics in 1944 for his discovery of nuclear magnetic resonance, which is used in magnetic resonance imaging.In 1950, spin echoes and free induction decay were first detected by Erwin Hahn [5] [6] and in 1952, Herman Carr produced a one-dimensional NMR spectrum as reported in his Harvard PhD thesis.