Amateur Telescope Making (The Patrick Moore Practical by Stephen Tonkin

By Stephen Tonkin

This publication presents an advent to the layout of various telescopes, mounts, and drives appropriate for the home-constructor. tasks contain tools that variety from a shoestring funds to professional units that aren't commercially on hand. The ability point of every venture is indicated and suggestion is equipped as to what's brilliant to build, given what's commercially on hand. tricks and suggestions are incorporated, in addition to listings of respected mail order resources of fabrics and elements.

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Extra resources for Amateur Telescope Making (The Patrick Moore Practical Astronomy Series)

Example text

These screws hold and provide longitudinal, lateral, and tilt adjustment of the diagonal stalk. The diagonal holder tube attaches to the vanes with two machine screws. It became apparent that the aluminium tube's softer threads were losing ground to the steel screws. The screws would eventually loosen, requiring more adjustment than I felt was necessary. Loctite did not hold because the aluminium holes were becoming oversized. 8 Reflector (125 mm) long. I drilled two holes per strip to accommodate two screws per strip.

The first of these is the miscellaneous hardware inside the tube - the shiny nuts and bolts used to mount the focuser, mirror cells, or what have you. All of these can benefit from a coat of matt-black paint. It is also worth while to blacken the bevel on your primary mirror with a black chisel-point felt marker or a small brush loaded with matt-black paint. This is most easily done with your arm braced and the mirror slowly rotating on a Lazy Susan bearing or other turntable. Similar attention should be given to the secondary mirror's rim.

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. However, for all but the very longest focal length mirrors, the ideal shape for the primary mirror is not a sphere, but a parabola.

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