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Sinopsis
This book offers a thorough guide to optimizing the performance and quality of astronomical telescopes, providing valuable insights for both amateur and experienced astronomers seeking to enhance their observations. By exploring the complexities of telescope optics and mechanics, the author delves into essential topics such as squaring on, achromatism, false centering, and astigmatism, which are critical factors in achieving the sharpest and most accurate images. Beyond technical considerations, the book also emphasizes the significance of understanding the relationship between the telescope's form and optical effects, enabling readers to make informed decisions about their equipment. The author s comprehensive approach and detailed explanations empower readers to troubleshoot common issues, adjust their telescopes with precision, and fully appreciate the limitations and capabilities of their instruments. Through practical guidance and theoretical foundations, this book serves as a valuable resource for astronomers of all levels, offering a deeper understanding of telescope optics and the means to unlock the full potential of their observations, ultimately enriching their exploration of the wonders of the night sky.
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Reseña del editor
Excerpt from On the Adjustment and Testing of Telescopic Objectives
Fig. 74. - The corresponding appearance to Fig. 73, as shown by a section taken at the same distance beyond focus. See page 28.
Fig. 75 - Section within focus, showing result of positive spherical aberration. See page 30.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Reseña del editor
Excerpt from On the Adjustment and Testing of Telescopic Objectives
In the first place it may be pointed out that portable and pocket telescopes of under three inches aperture and used for terrestrialpurposes, are adjusted by their makers before being sent out, and moreover are not usually supplied with apparatus for adjustment, as the comparatively low magnifying powers used on such telescopes renders a perfect adjustment of the objective unnecessary. Of course, good objectives for astronomical purposes, if supplied with tube and mounting, are also sent out in good adjustment, as far as possible; nevertheless, after they have been in use for some time, or the objective has been taken out for cleaning, &c., or still more, if they have changed hands and undergone vicissitudes of some sort or another, there will arise need for more or less readjustment of the objective with respect to its tube, or squaring on as the operation is called.
Sometimes the maker has to supply a large telescope to be put up at some distant place (in Australia, for instance), in which case it may be impracticable to send some well qualified person to see to the final adjustment of the objective in its tube; or again, an objective may be supplied by itself, in which case its adjustment by the maker is not demanded, but is undertaken by its owner or a friend. It is therefore very important that anyone who uses an astronomical telescope of any considerable aperture should be able to perform the operation of squaring on the objective to a nicety, for unless this is done the telescope will not perform its best with the highest magnifying powers, especially in the'way of separating difficult double stars.
Technically, the operation called squaring on means the adjustment of the optical axis of the objective until it passes accurately through the centre of the eye-piece. If the objective is not squared on, its Optical axis falls more or less to one side of the centre of the eye-piece, and we have the condition of things shown in Fig. I, where o-a is the optical axis of the objective, falling to one side of the eye - piece, so that the latter is looking obliquely at the objective, as it were. It is impossible for all the rays passing through the objective to focus accurately to a point on the oblique axis o-a, whatever the type of objective may be, although, as will be pointed out further on, there is one type which renders possible a nearer approach to good definition on an oblique axis. If the objective is squared on the Optical axis ma will now be transferred to the position passing centrally through the eye - piece.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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On the Adjustment and Testing of Telescopic Objectives (Classic Reprint)
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Paperback. Condición: New. Print on Demand. This book offers a thorough guide to optimizing the performance and quality of astronomical telescopes, providing valuable insights for both amateur and experienced astronomers seeking to enhance their observations. By exploring the complexities of telescope optics and mechanics, the author delves into essential topics such as squaring on, achromatism, false centering, and astigmatism, which are critical factors in achieving the sharpest and most accurate images. Beyond technical considerations, the book also emphasizes the significance of understanding the relationship between the telescope's form and optical effects, enabling readers to make informed decisions about their equipment. The authorâs comprehensive approach and detailed explanations empower readers to troubleshoot common issues, adjust their telescopes with precision, and fully appreciate the limitations and capabilities of their instruments. Through practical guidance and theoretical foundations, this book serves as a valuable resource for astronomers of all levels, offering a deeper understanding of telescope optics and the means to unlock the full potential of their observations, ultimately enriching their exploration of the wonders of the night sky. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Nº de ref. del artículo: 9781333629656_0
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