46 SCIENCE. 



How to Find the Stars. 



T i 



By Rev. James Freeman Clarke. 4% by 5^ inches. Paper. 47 pages. 

 Introduction price, 15 cents. 



'HE object of this little book is to help the beginner to become 

 better acquainted, in the easiest way, with the visible starry 

 heavens ; to know the winter and summer constellations, and the 

 principal fixed stars. It shows the position of the constellations at 

 different periods of the year, giving their place in each of the four 

 seasons. It also shows how to find the separate clusters by a series of 

 triangles and diagrams, covering the whole heavens, and connecting 

 each constellation with its neighbors. It indicates the most interesting 

 objects at each period of the year, especially such as can be found with 

 a telescope of moderate power. It closes with a description of the 

 Astronomical Lantern. 



An Astronomical Lantern. 



Invented by Rev. James Freeman Clarke, Boston. Japanned tin; the 

 face (6^ by 10 inches in size) is of ground glass, behind which lights may 

 be placed. Thirty-two constellations are photographed upon seventeen 

 slides of semi-transparent card-board, and stars of four magnitudes are rep- 

 resented by perforations of proper size. The maps have been prepared 

 under Dr. Clarke's personal supervision, and the plates, being photographed 

 from the original drawings, are correct in every particular. The former price 

 of the Lantern was $6.00 ; we now offer it, in improved form, with the 

 slides, and a copy of " How to Find the Stars," for $4.50. The whole care- 

 fully packed in a wooden box, with sliding cover. 



n^HE object of this useful piece of apparatus is to facilitate the 

 study of stellar astronomy. It is intended for beginners in 

 astronomy in schools and in families, and, in fact, for all who desire 

 to become acquainted with the constellations. 



The difficulty hitherto experienced in this study, and which is obvi- 

 ated by the use of the lantern, is this : In order to study the starry 

 heavens, it has been necessary to use an astronomical atlas or a celes- 

 tial globe. These must be examined in the house, by the light of a 

 lamp. The observer, having found his constellation on the atlas, goes 

 out to look for it in the sky. But by the time he gets out of doors, 

 he has forgotten how it looked on the atlas. And when he has found 

 it in the sky, he forgets how it looked there, before he gets back to his 

 atlas or globe. 



