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One potential option was to insert corrective optics, lenses or mirrors in the telescope tube between the primary mirror and the secondary reflector. However the tube was too narrow for even the smallest astronaut to slither down it, leading to a search for a means of inserting the required corrective components into the tube.
It is also known as a surveyor's level, builder's level, dumpy level or the historic "Y" level. It operates on the principle of establishing a visual level relationship between two or more points, for which an inbuilt optical telescope and a highly accurate bubble level are used to achieve the necessary accuracy. Traditionally the instrument ...
Air drawn through the system must be clean, dry and oil free in order to protect the delicate optical equipment including mirrors and lenses. It is crucial that the design of the system ensures that the flow of air does not draw in any contaminants from outside sources.
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Important: WP-mirror hasn't been supported since 2014, and community verification is needed that it actually works. See talk page. WP-MIRROR is a free utility for mirroring any desired set of WMF wikis. That is, it builds a wiki farm that the user can browse locally. WP-MIRROR builds a complete mirror with original size media files.
The builders, Wakeham Bros. of Plymouth, began work on the foundations in October 1903. [8] Chance & Co of Birmingham supplied and fitted the lantern. [ 9 ] A pressurised vapour paraffin lamp was used, placed at the centre of a large ( first-order ) revolving optic ; weighing 3.5 tons, this was made up of four asymmetrical catadioptric lens ...
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