By Peter L. Manly
Many novice astronomers make their very own tools, both as a result of monetary concerns or simply because they're simply . novice Telescope Making deals numerous designs for telescopes, mounts and drives that are compatible for the home-constructor. The designs diversity from easy to complex, yet all are in the variety of a reasonably well-equipped domestic workshop. The ebook not just tells the reader what he can build, but in addition what it really is brilliant to build given what time is accessible commercially. hence each one bankruptcy starts off with purposes for venture the venture, then seems to be at theoretical attention sooner than completing with sensible directions and recommendation. a sign is given as to the abilities required for some of the initiatives. Appendices checklist respected assets of (mail order) fabrics and elements. The telescopes and mounts diversity from "shoestring" (very affordable) tools to professional units which are unavailable commercially.
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Additional info for Amateur Telescope Making (1998)(en)(259s)
If the very thought of going near these pristine shiny mirror surfaces with matt-black paint makes you break out in a cold sweat, skip these steps. There is no point in making a nervous wreck out of yourself for the sake of improved baffling! Two remaining sources of stray light lie at either end of the tube. Look down the front of your telescope. Is it Specialised Telescopes possible to see past the primary mirror and out of the back of the tube? If it is, you'll want to take care of this, since a substantial amount of light originating from this location can reach the focal plane.
Apply a generous coat of matt-black paint to the inside of the tube. (Note: It is worth testing different brands of such paint. ) Before the paint begins to dry, throw several handfuls of sawdust or Slip-Not (a paint additive made of walnut shells crushed to the consistency of sand) down the tube. Distribute this material evenly by laying the tube on its side and rolling it over and over. Once the paint has dried, the majority of these particles will be firmly affixed to the tube wall. A few gentle taps to the tube should dislodge any loose pieces.
First, it is far easier to make a long focal length mirror. The curve is much shallower and the amount of work required to bring such a mirror to the figuring stage is proportionately reduced. The second important advantage results from the nature of the Foucault test. This elegant yet simple analytical tool is a null test for spherical mirrors. What this means is that a perfectly spherical mirror will grey out evenly, or "null", during the test. Under these conditions, small defects in the mirror's surface stand out in stark relief.