Telescope: The Principles Involved in the Construction of Refracting and Reflecting TelescopesD. Van Nostrand, 1881 - 75 páginas |
Otras ediciones - Ver todas
The Telescope: The Principles Involved in the Construction of Refracting and ... Thomas Nolan Sin vista previa disponible - 2018 |
The Telescope: The Principles Involved in the Construction of Refracting and ... Thomas Nolan Sin vista previa disponible - 2018 |
The Telescope: The Principles Involved in the Construction of Refracting and ... Thomas Nolan Sin vista previa disponible - 2015 |
Términos y frases comunes
achromatic angle aperture appear inverted astronomical axis BRIDGES center of curvature chromatic aberration cloth colors compound lens Conse construction converging power convex lens crown glass curve diameter direction dispersive power distance diverge double convex emerge parallel Engineer equal eye-glass eye-piece falling field of view flint glass focal length focus of parallel focus of PQ Galilean telescope Illustrated image formed image is formed incident parallel rays indices of refraction infinitely distant instrument ject linear magnitude magnifying power Messrs mirror Newtonian Telescope NOSTRAND'S PUBLICATIONS object-glass parabolic parallel by PQ plano-convex PLYMPTON polishing of specula PQ Fig PQ is greater PRACTICAL TREATISE PRESCOTT principal focus pupil radii rays of light reflecting telescope reflector refractor rendered parallel retina revised showing objects erect simple refracting telescope specu speculum spherical aberration spherical lenses STEAM struction subtends surface Third edition tion tube violet wood-cuts
Pasajes populares
Página 63 - PLATTNER.— Manual of Qualitative and Quantitative Analysis with the Blow-Pipe. From the last German edition, revised and enlarged. By Prof. Th. Richter, of the Royal Saxon Mining Academy. Translated by Prof. H. B. Cornwall, assisted by John H.
Página 65 - CHEMICAL EXAMINATION OF ALCOHOLIC LIQUORS. — A Manual of the Constituents of the Distilled Spirits and Fermented Liquors of Commerce, and their Qualitative and Quantitative...
Página 58 - FANNING, JT A Practical Treatise on Hydraulic and Water-supply Engineering. Relating to the Hydrology, Hydrodynamics and Practical Construction of Water-works in North America.
Página 65 - OF PROXIMATE ORGANIC ANALYSIS for the Identification, Separation, and Quantitative Determination of the more commonly occurring Organic Compounds.
Página 65 - Arms, and Stains, as applied to Chemical Jurisprudence, for the use of Chemists, Physicians, Lawyers, Pharmacists and Experts. Translated, with additions, including a list of books and memoirs on Toxicology, etc., from the French...
Página 61 - NOTES ON ENGINEERING CONSTRUCTION. Embracing Discussions of the Principles Involved, and Descriptions of the Material employed in Tunneling, Bridging, Canal and Road Building, etc., etc. By J. E. Shields, CE 12mo.
Página 59 - The THEORY of STRAINS in GIRDERS and similar Structures, with Observations on the application of Theory to Practice, and Tables of the Strength and other Properties of Materials.
Página 49 - B (Fig. 28), of the same focus, placed at a distance of two-thirds the focal length of either apart. They are both on the eye side of the focus of the object-glass, and act together to render the rays parallel, and give a magnified virtual image of FF'. This eye-piece is not strictly achromatic, but suffers least of all from spherical aberration, and has the advantage of being placed behind the focus of the object-glass, which makes it superior to others in instruments of precision.
Página 24 - ... at o'b'. While the Herschelian has the brightest image of all the reflecting telescopes, with a given aperture, and possesses the advantage — so thoroughly appreciated by those in the habit of observing for many consecutive hours — of allowing the observer always to look downward, its disadvantages are still many. It cannot produce the finest definition, because the reflecting surface cannot bring the rays to an exact focus when they are thrown so far to one side of the axis of the tube;...
Página 45 - Professor Steinheil communicated to the Royal Academy of Sciences at Munich, a notice of an object-glass of the form shown in (Fig. '.'4), executed according to the system of curves proposed by Gauss. The curves in this combination bear a considerable resemblance to the systems designed with express reference to the correction of spherical aberration, and for a long time...