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Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction.   By: (1837-1888)

Book cover

First Page:

[Illustration: PLATE I. Maps I. IV.]

HALF HOURS

WITH

THE TELESCOPE;

BEING A POPULAR GUIDE TO THE USE OF THE TELESCOPE AS A MEANS OF AMUSEMENT AND INSTRUCTION.

BY

RICHARD A. PROCTOR, B.A., F.R.A.S., AUTHOR OF "SATURN AND ITS SYSTEM," ETC.

WITH ILLUSTRATIONS ON STONE AND WOOD.

An undevout astronomer is mad: True, all things speak a God; but, in the small Men trace out Him: in great He seizes man. YOUNG.

NEW YORK:

G.P. PUTNAM'S SONS.

1873.

LONDON:

PRINTED BY WILLIAM CLOWES AND SONS, STAMFORD STREET AND CHARING CROSS.

PREFACE.

The object which the Author and Publisher of this little work have proposed to themselves, has been the production, at a moderate price, of a useful and reliable guide to the amateur telescopist.

Among the celestial phenomena described or figured in this treatise, by far the larger number may be profitably examined with small telescopes, and there are none which are beyond the range of a good 3 inch achromatic.

The work also treats of the construction of telescopes, the nature and use of star maps, and other subjects connected with the requirements of amateur observers.

R.A.P.

January , 1868.

CONTENTS.

CHAPTER I. PAGE A HALF HOUR ON THE STRUCTURE OF THE TELESCOPE 1

CHAPTER II. A HALF HOUR WITH ORION, LEPUS, TAURUS, ETC. 33

CHAPTER III. A HALF HOUR WITH LYRA, HERCULES, CORVUS, CRATER, ETC. 47

CHAPTER IV. A HALF HOUR WITH BOOTES, SCORPIO, OPHIUCHUS, ETC. 56

CHAPTER V. A HALF HOUR WITH ANDROMEDA, CYGNUS, ETC. 66

CHAPTER VI. HALF HOURS WITH THE PLANETS 74

CHAPTER VII. HALF HOURS WITH THE SUN AND MOON 93

DESCRIPTION OF PLATES.

PLATE I. Frontispiece.

This plate presents the aspect of the heavens at the four seasons, dealt with in Chapters II., III., IV., and V. In each map of this plate the central point represents the point vertically over the observer's head, and the circumference represents his horizon. The plan of each map is such that the direction of a star or constellation, as respects the compass points, and its elevation, also, above the horizon, at the given season, can be at once determined. Two illustrations of the use of the maps will serve to explain their nature better than any detailed description. Suppose first, that at one of the hours named under Map I. the observer wishes to find Castor and Pollux: Turning to Map I. he sees that these stars lie in the lower left hand quadrant, and very nearly towards the point marked S.E.; that is, they are to be looked for on the sky towards the south east. Also, it is seen that the two stars lie about one fourth of the way from the centre towards the circumference. Hence, on the sky, the stars will be found about one fourth of the way from the zenith towards the horizon: Castor will be seen immediately above Pollux. Next, suppose that at one of the hours named the observer wishes to learn what stars are visible towards the west and north west: Turning the map until the portion of the circumference marked W ... N.W. is lowermost, he sees that in the direction named the square of Pegasus lies not very high above the horizon, one diagonal of the square being vertical, the other nearly horizontal. Above the square is Andromeda, to the right of which lies Cassiopeia, the stars [beta] and [epsilon] of this constellation lying directly towards the north west, while the star [alpha] lies almost exactly midway between the zenith and the horizon. Above Andromeda, a little towards the left, lies Perseus, Algol being almost exactly towards the west and one third of the way from the zenith towards the horizon (because one third of the way from the centre towards the circumference of the map). Almost exactly in the zenith is the star [delta] Aurigæ.

The four maps are miniatures of Maps I... Continue reading book >>




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