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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 [ fr ] developed a process of glass casting that enabled first truly large glass mirrors, impossible to make using the traditional glass blowing ...
PLate OPtimizer, or PLOP is a CAD program used by amateur telescope makers to design primary mirror support cells for reflecting telescopes. It was developed by telescope maker David Lewis, first described in 1999, [ 1 ] and used to simplify calculations needed in the design of mirror support cells. [ 2 ]
In the following equations, denotes the sagitta (the depth or height of the arc), equals the radius of the circle, and the length of the chord spanning the base of the arc. As 1 2 l {\displaystyle {\tfrac {1}{2}}l} and r − s {\displaystyle r-s} are two sides of a right triangle with r {\displaystyle r} as the hypotenuse , the Pythagorean ...
605 cm f/4 M1 mirror: Mirror replaced twice: 2070 1948–1976: Hale (200 inch) 5.1 – 508 cm f/3.3 M1 mirror: Art deco dome: 1713 1917–1948: Hooker (100 inch) 2.54 – Also used for 1st optical interferometer: 1742 For earlier entries, see List of largest optical telescopes historically
The Hale's 200 in (510 cm) mirror was near the technological limit of a primary mirror made of a single rigid piece of glass. [ 22 ] [ 23 ] Using a monolithic mirror much larger than the 5-meter Hale or 6-meter BTA-6 is prohibitively expensive due to the cost of both the mirror, and the massive structure needed to support it.
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