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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Chromatic Aberration of Several Important Refractors of the 19th and 20th Century
 Rail, Zdeněk ; Jareš, Daniel ; Tomka, David ; Doleček, Roman
In 19th century refractors dominated in astronomical research. Lenses of these devices were made of the classical glasses. Main optical aberration of these telescopes was residual chromatism. In this paper residual chromatism of several important refractors is shown. We managed to get optical parameters of 40, 36, 25 inch refractors of Alvan Clark, 12 inch telescope of Greenwiche observatory and 6 inch heliometer of Joseph Fraunhofer with which paralax of star was measured for the first time. The paper contains parameters of the dublet of König telescope of Prague‘s observatory
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