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Goble, L. W., et al. "Spincasting of a 3.5-m diameter f/1.75 mirror blank in borosilicate glass." Advances in Fabrication and Metrology for Optics and Large Optics. Vol. 966. International Society for Optics and Photonics, 1989. Hill, J. M., and J. R. P. Angel. "The Casting of the 6.5 m Borosilicate Mirror for the MMT Conversion.
Segmented mirrors are typically hexagonal and arranged in a honeycomb pattern. A segmented mirror is an array of smaller mirrors designed to act as segments of a single large curved mirror. The segments can be either spherical or asymmetric (if they are part of a larger parabolic reflector [1]). They are used as objectives for large reflecting ...
The size of individual mirrors was still small: the 17 seemingly large window-like panes in the Hall of Mirrors are in fact stitched from 357 small pieces of mirror glass. [12] In 1687, Bernard Perrot developed a process of glass casting that enabled first truly large glass mirrors, impossible to make using the traditional glass blowing process.
A 3.1-metre (10 ft) secondary mirror is to produce an unobstructed field-of-view of 20 arcminutes in diameter with a focal ratio of 15. A 3.5-by-2.5-meter (11.5 ft × 8.2 ft) flat tertiary mirror is to direct the light path to science instruments mounted on large Nasmyth platforms. [57] [58] The telescope is to have an alt-azimuth mount. [59]
An Oklahoma woman was arrested on Tuesday, Dec. 24 after her baby was allegedly abandoned at a Florida hotel and casino. Rubi Verduzco, 29, was taken into custody on two counts of felony child ...
Officials have so far recovered 44 packages, allowing them to be “delivered to their rightful owners.” Lewis was charged with grand theft, illegal dumping and organized scheme to defraud.
Nikon (under the Mirror-Nikkor and later Reflex-Nikkor names) and Canon both offered several designs, such as 500 mm 1:8 and 1000 mm 1:11. Smaller companies such as Tamron , Samyang , Vivitar , and Opteka also offered several versions, with the three latter of these brands still actively producing a number of catadioptric lenses for use in ...
A little-known University of Georgia football player accidentally stepped into the limelight Thursday, costing his team 15 valuable yards and earning a permanent spot in social media infamy.
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