436 SEC. 11. ASTRONOMY. 



Acadeuiia regia Monasteriensi. Colonise ad Rhemmi 1872, impensis 

 M. Du Mont Schauberg. Catalogus Stella-rum. 



I. Two volumes bound. 



II. Thirteen plates for hanging on the wall. 



Prof. E. Hcis, Miinster. 



The Atlas Coelestis Novus, the result of observation extending over 2 7 years, 

 gives the appearance of the starry heaven as it is seen at the present day with 

 the naked eye. It is more especially remarkable for containing, besides the 

 stars of the 1st to 6th magnitude, those also between the 6th and 7th magni- 

 tude, which the author himself can easily distinguish. All the stars, without 

 exception, are compared with one another in respect of magnitude by the 

 naked eye, with the additional employment of other means of assistance ; 

 thus, among others, has been used the " method of sequences " of Sir John 

 Herschel (see Results of Astronomical Observations at (he Cape of Good 

 Hope). The total number of stars observed by the author is 5,421. or 2,153 

 more than will be found in Argelander's Nova Uranometria. As no single 

 star has been entered which has not been many times observed and compared, 

 future observers will be able to judge whether in the course of centuries the 

 sky has changed, whether any of the stars increase or diminish in brightness, 

 whether some have disappeared, or others come into view. 



The author has paid particular attention to drawing the milky-way with the 

 greatest accuracy, and to show the brightness of the different parts in 

 5 degrees. For this purpose, the drawings made by Sir John Herschel of the 

 milky-way in the southern sky were taken as models. The figures of the 

 old constellations are copied from the classic figures on the ancient celestial 

 globe in the Royal Museum at Naples. In the catalogue of the stars arranged 

 according to the 57 constellations, their right ascensions and declinations, 

 (Aug. 1855) are given; there are added also the numbers of Bayer and of 

 Elamsteed (according to Miss Caroline Herschel) ; and also the numbers in the 

 catalogue of the British Association for the Advancement of Science, and 

 other catalogues. 



1916. Chronometrograph, for the determination of true time. 

 (Original drawing.) Prof. Dr. Prcstel, Emden. 



1917. Pictorial Representation of the Solar System, for 



the demonstration of the relative sizes of the sun and planets, also 

 of the relative distances of the planets from the sun, and of the 

 inclination of their orbits to the ecliptic. (Original drawing.) 



Prof. Dr. Prestel, Emden. 



1918. Chart of the whole Celestial Sphere in epieyeloidal 

 projection. Dr. F. August, Berlin. 



This map gives a simultaneous view of the whole sidereal heaven. Each 

 constellation preserves its proper form, for the representation is conformable, 

 that is, proportional in the smallest parts. There is no want of conformity at 

 any point, not even at the poles, so that even there the meridians cut each 

 other at the correct angle. By this means the spherical form is always- 

 pictured to the eye ; the arrangement of the map is easily imagined, by 

 supposing an elastic envelope to be stretched about a celestial sphere, then cut 

 open along a meridian and stretched on a frame. The course of the milky- 

 way which follows one of the great circles of the heavens, and the parts com- 

 paratively free from stars which are at the poles of this great circle, are very 



