By Scientific American
From the longest working column in clinical American's historical past comes this number of interesting initiatives for newbie astronomersFor over seventy years, "The beginner Scientist" column in medical American has helped humans discover their global and make unique discoveries. This number of either vintage and up to date articles provides initiatives for newbie astronomers in any respect degrees. Hands-on astronomy enthusiasts will locate the best way to construct reasonably cheap astronomical tools utilizing traditional shop-tools. From creating a telescope to predicting satellite tv for pc orbits to detecting the chemical composition of far flung stars, this booklet has whatever for everybody attracted to functional astronomy.
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Extra info for Scientific American The Amateur Astronomer (Scientific American (Wiley))
Example text
Stop at this point, add another teaspoon of water and resume grinding until the work again feels gummy. Both the mirror and tool are removed from the bench and washed free of ''mud," Page 8 the mixture of pulverized glass and powdered abrasive that results from grinding. " Fresh Carborundum is now applied, and the procedure is continued for three additional wets. The stroke is then shortened to a third of the diameter of the mirror (two inches in the case of a six-inch mirror) for two more wets.
When work must be suspended for some hours, coat the lap with rouge and cold-press without added weight. It is well to brace the mirror around the edges when it remains on the lap for some hours, because pitch flows slowly and may deposit an unbraced mirror on the floor. The shape of the mirror is now close to a perfect sphere. The center will doubtless have a somewhat longer radius than the region near the edge. Precisely the reverse situation is desired: a curve whose radius increases from the center outward.
The kits also supply a small rectangle of flat plate-glass that serves as the diagonal, a series of abrasive powders ranging from coarse to fine, a supply of optical rouge for polishing and a quantity of pine pitch. Page 6 As Russell Porter explained in 1925, "In the reflecting telescope, the mirror's the thing. " Fortunately it is all but impossible to make a really poor mirror if one follows a few simple directions with reasonable care. The idea is to grind one face of the six-inch mirror-blank to a shallow curve about a 16th of an inch deep, polish it to a concave spherical surface and then, by additional polishing, deepen it increasingly toward the center so that the spherical curve becomes a paraboloid.