On the Construction of a Silvered Glass Telescope Fifteen And a Half Inches in
On the Construction of a Silvered Glass Telescope Fifteen And a Half Inches in
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Optical glass, which may be made by softening down irregular fragments into moulds at a temperature below that of fusion, may have the same difficulty, but whether it has a diameter of minimum compression can only be determined by experiment. Why speculum metal should have the same property might be ascertained by a critical examination of the process of casting, 8 ON THE CONSTRUCTION AND USE OF and the effect of the position of the openings in the mould for the entrance of the molten metal.
Ef...fects of Heat. The preceding changes in glass when isolated appear very simple, and their remedy, to keep the proper diameter perpendicular, is so obvious that it may seem surprising that they should have given origin to any embarrassment. In fact it is now desirable to have a disk in which they are well marked. But in practice they are complicated in the most trying manner with variations produced by heat pervading the various parts of the glass unequally. The following case illustrates the effects of heat : A 15| inch mirror, which was giving at its centre of curvature a very fine image 1 (a, Fig.
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To quickly assess the difficulty of the text, read a short excerpt:
Optical glass, which may be made by softening down irregular fragments into moulds at a temperature below that of fusion, may have the same difficulty, but whether it has a diameter of minimum compression can only be determined by experiment. Why speculum metal should have the same property might be ascertained by a critical examination of the process of casting, 8 ON THE CONSTRUCTION AND USE OF and the effect of the position of the openings in the mould for the entrance of the molten metal.
Ef...fects of Heat. The preceding changes in glass when isolated appear very simple, and their remedy, to keep the proper diameter perpendicular, is so obvious that it may seem surprising that they should have given origin to any embarrassment. In fact it is now desirable to have a disk in which they are well marked. But in practice they are complicated in the most trying manner with variations produced by heat pervading the various parts of the glass unequally. The following case illustrates the effects of heat : A 15| inch mirror, which was giving at its centre of curvature a very fine image 1 (a, Fig.
What to read after On the Construction of a Silvered Glass Telescope Fifteen And a Half Inches in?
You can find similar books in the "Read Also" column, or choose other free books by Henry Draper to read onlineMoreLess
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