http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f5-subject%3DGeiger%20Counter;f4-associated-Lesson%3DX-Ray%20History;f6-type%3DArtwork Results for your query: expand=subject;f5-subject=Geiger Counter;f4-associated-Lesson=X-Ray History;f6-type=Artwork Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/Geiger_counter_patent/Geiger_counter_patent.dc.xml Friedman holds U.S. Patent No. 2,475,603, for an adaptation of the tube used in a Geiger-Mueller counter. His tube design increased the counter's sensitivity to weak radiation sources by lowering the background noise of the counter itself. Figure 1 (upper left) is a cut-away view of Friedman's counter tube mounted within a container, called a shield. Figure 2 (lower left) is a front-end view of the tube. Figure 3 (upper right) is a cross-section of the tube showing the arrangement of parts and the structure used for mounting the tube within the shield. Figure 4 (lower right) is a cross-section diagram showing the tube anode and cathode, and a plot of the electric field within the tube. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/Geiger_counter_patent/Geiger_counter_patent.dc.xml Thu, 01 Jan 1970 12:00:00 GMT