Telescope: The Principles Involved in the Construction of Refracting and Reflecting Telescopes

D. Van Nostrand, 1881 - 75 Seiten

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Seite 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.
Seite 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;...
Seite 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...

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