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Sometimes they are fraudulently advertised as "infrared" binoculars. Because a typical binocular has 6 to 10 optical elements [52] with special characteristics and up to 20 atmosphere-to-glass surfaces, binocular manufacturers use different types of optical coatings for technical reasons and to improve the image they produce. Lens and prism ...
Periscopes, in some cases fixed to rifles, served in World War I (1914–1918) to enable soldiers to see over the tops of trenches, thus avoiding exposure to enemy fire (especially from snipers). [6] The periscope rifle also saw use during the war – this was an infantry rifle sighted by means of a periscope, so the shooter could aim and fire ...
This is a list of United States Army fire control, and sighting material by supply catalog designation, or Standard Nomenclature List (SNL) group "F".The United States Army Ordnance Corps Supply Catalog used an alpha-numeric nomenclature system from about the mid-1920s to about 1958.
The First World War was the first major conflict where more gun laying was made by optical equipment such as binoculars and rangefinders than by unaided eye. These tools were essential for the accurate fire control of artillery pieces which were now shooting at ranges of up to 40,000–60,000 yards (37–55 km). [ 1 ]
History of Optics (audio mp3) by Simon Schaffer, Professor in History and Philosophy of Science at the University of Cambridge, Jim Bennett, Director of the Museum of the History of Science at the University of Oxford and Emily Winterburn, Curator of Astronomy at the National Maritime Museum (recorded by the BBC
Its stated aim was to describe the major processes and events of world history across a broad canvas and omit tiny details of, say, ruling families, minor battles etc. It wished to give a dynamic view of population migrations, economic developments such as agriculture and industrialisation, wars, the spread of religions and political ideologies.
Double Porro prism systems are used in small optical telescopes to re-orient an inverted image (an arrangement is known as an image erection system), and especially in many binoculars where they both erect the image and provide a longer, folded distance between the objective lenses and the eyepieces. When there is an air gap between the two ...
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