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Download Making Your Own Telescope by Allyn J. Thompson PDF

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By Allyn J. Thompson

Whole, specified directions and various diagrams for developing a homemade telescope. No advanced arithmetic are concerned, and no earlier wisdom of optics or astronomy is required to persist with the text's step by step instructions. Contents hide, between different issues, fabrics and kit; tube components and alignment; eyepieces, and comparable difficulties; surroundings circles; and optical ideas. 6 plates. a hundred figures.

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15. The template. Tlte Template. This is used to gauge the curve on the mirror during coarse grinding. It should he given a radius of curvature of 98", although the completed mirror should have a radius of 96". 010" in thickness, and about 8" square. To cut the curve, first nail the sheet metal to the floor. Drill two holes 98" apart in the ends of a long stick, and nail one end to the floor so that the other end is free to swing across the metal sheet. Insert the point of a 3° MAKING YOUR OWN TELESCOPE strong knife blade into the hole at the free end, and cut through the metal in a single sweep.

With the magnifier, examine the con· vex edge for burrs, and carefully file them off. The template should be protected from bending by securing it between two thin boards, with its edge protruding about Yt". 001" in the sagitta of the mirror means a difference of about 1" in focal length, great care must be exercised in testing with the template; watch carefully for any streaks of light that might show up between its edge and thc surface of the mirror. See Fig. 15 for a diagram of the finished template.

When the curve in the small central area of the mirror seems right, take the next series of strokes on chords farther in on the tool. Spread the abrasive now over a wider zone, Fig. 25. How the curve move the mirror in so that its cenis obtained by use of ter is about I" inside the edge of the conventional method the tool, and grind as before. Apof grinding the mirror. ply plenty of pressure for quickest results. Frequent renewal of abrasive is necessary in the early stages. as much of it is pushed over the edge without being used.

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