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The idea came to him that they could mount the required corrective components on such a device that would allow them to be inserted into the tube before being folded out on robotic arms to the required position to intercept the beams of light from the secondary mirror, correct and then focus them on the various scientific instruments. [4]
A French cleat is a way of securing a cabinet, mirror, tools, artwork or other objects to a wall. [1] It is a molding with a 45 degree slope used to hang cabinets or other objects. The method has been described as simple and strong, [ 2 ] but also elegant since it often can be mounted hidden behind a cabinet.
The Nasmyth design is similar to the Cassegrain except the light is not directed through a hole in the primary mirror; instead, a third mirror reflects the light to the side of the telescope to allow for the mounting of heavy instruments. This is a very common design in large research telescopes.
When the two mirrors are on one mount, the combined mirror spacing of the Large Binocular Telescope (22.8 m) allows fuller use of the aperture synthesis. Largest does not always equate to being the best telescopes, and overall light gathering power of the optical system can be a poor measure of a telescope's performance.
Instruments can be mounted at a Cassegrain focus below the primary mirror; at either of two Nasmyth focal points in enclosures on the sides of the telescope mount, to which light can be directed with a tertiary mirror; or at the prime focus in lieu of a secondary mirror, an arrangement rare on large telescopes, to provide a wide field of view ...
The Mirror and the Light will track the final four years of Henry VIII’s life, detailing his journey from a self-made man to a feared, influential figure. “The inevitable question remains: how ...
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