Telescope: The Principles Involved in the Construction of Refracting and Reflecting TelescopesD. Van Nostrand, 1881 - 75 páginas |
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Página 15
... rendered converging towards O ' by MN , and af- terwards parallel by PQ . They are also much denser than before ... parallel rays as CD and its two parallels , which are refracted towards some point b , and then rendered parallel by PQ ...
... rendered converging towards O ' by MN , and af- terwards parallel by PQ . They are also much denser than before ... parallel rays as CD and its two parallels , which are refracted towards some point b , and then rendered parallel by PQ ...
Página 15
... rendered converging towards O ' by MN , and af- terwards parallel by PQ . They are also much denser than before ... parallel rays as CD and its two parallels , which are refracted towards some point b , and then rendered parallel by PQ ...
... rendered converging towards O ' by MN , and af- terwards parallel by PQ . They are also much denser than before ... parallel rays as CD and its two parallels , which are refracted towards some point b , and then rendered parallel by PQ ...
Página 25
... parallel to the axis . B form in an image of that point , whence , falling in PQ they are rendered parallel to each other , but oblique to the axis till they meet RS , by which they re- fracted to the second focus b ' ; whence , falling ...
... parallel to the axis . B form in an image of that point , whence , falling in PQ they are rendered parallel to each other , but oblique to the axis till they meet RS , by which they re- fracted to the second focus b ' ; whence , falling ...
Página 30
... parallel , and the image found half - way between the mirror and its center of curvature . In regard to the convex ... render them less convergent . In ( Fig . 10 ) we consider the light , af- ter having been reflected from some con ...
... parallel , and the image found half - way between the mirror and its center of curvature . In regard to the convex ... render them less convergent . In ( Fig . 10 ) we consider the light , af- ter having been reflected from some con ...
Página 32
... rendered less convergent . As the image formed by the concave speculum of a telescope is on the same side as the ... Parallel rays , falling on AD , are re- flected to the side of the tube , where the G A D 32.
... rendered less convergent . As the image formed by the concave speculum of a telescope is on the same side as the ... Parallel rays , falling on AD , are re- flected to the side of the tube , where the G A D 32.
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
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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...