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In the largest telescopes, the mass and cost of an equatorial mount is prohibitive and they have been superseded by computer-controlled altazimuth mounts. [5] The simple structure of an altazimuth mount allows significant cost reductions, in spite of the additional cost associated with the more complex tracking and image-orienting mechanisms. [6]
Equatorial telescope mounts come in many designs. In the last twenty years [when?] motorized tracking has increasingly been supplemented with computerized object location. There are two main types. Digital setting circles take a small computer with an object database that is attached to encoders. The computer monitors the telescope's position ...
Telescope mounts are designed to support the mass of the telescope and allow for accurate pointing of the instrument. Many sorts of mounts have been developed over the years, with the majority of effort being put into systems that can track the motion of the fixed stars as the Earth rotates .
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The James Webb Space Telescope's cryocooler is based originally on the TRW ACTDP cryocooler. [12] However, the JWST has had to develop a version to handle higher thermal loads. [13] It has a multi-stage pulse tube refrigerator that chills an even more powerful cooler. [12] That is a linear-motion Oxford-style compressor that powers a J-T loop. [13]
Historically, The Royal Photographic Society recommended the thread standard for attaching older cameras to tripods was 3/16-24 BSW (3/16 inch nominal diameter, 24 threads per inch), or 1/4-20 BSW [4] for smaller cameras and 3/8-16 BSW [5] for larger cameras and pan/tilt heads. In this application, the BSW and UNC thread profiles are similar ...
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