Tests of Small Telescopes at the Laboratory of the Dominion Lands Surveys (Classic Reprint) - Couverture souple

Deville, Edouard

9781527893054: Tests of Small Telescopes at the Laboratory of the Dominion Lands Surveys (Classic Reprint)

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ISBN 10 : 1527893057 ISBN 13 : 9781527893054

Editeur : Forgotten Books, 2018

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�diteur: Forgotten Books
Date d'�dition: 2018
Langue: anglais
ISBN 10: 1527893057
ISBN 13: 9781527893054
Reliure: Broch�
Nombre de pages: 30
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Tests of Small Telescopes at the Laboratory of the Dominion Lands Surveys

Edouard Deville

Edit� par Forgotten Books, 2024

ISBN 10 : 1527893057 ISBN 13 : 9781527893054

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Vendeur : Forgotten Books, London, Royaume-Uni

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Paperback. Etat : New. Print on Demand. This book details the methodology used by the Dominion Lands Surveys laboratory for evaluating the quality of small telescopes by way of a series of experiments that set out to determine the effects of various aberrations on the resolution of a telescope. Through visual experiments, the author concludes that the highest visual acuity is achieved at a distance of approximately 7.5 meters and found that the resolution of the human eye was proportional to the diameter of the pupil aperture up to 0.9 mm, at which point the resolution of the eye increased more slowly than the aperture until it reached unity for an aperture of 2.5 mm. The results of these experiments were then used to develop a method for testing the resolution of small telescopes which could be used to determine the quality of a telescope's objective and ocular. The book concludes that a telescope's resolution is limited either by the resolution of the objective or by the resolution of the eye in conjunction with the ocular, and that the best size for a surveyor's telescope is the smallest that will just meet his requirements. 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. N� de r�f. du vendeur 9781527893054_0

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