X. MODELS, ETC. 377 



Academia regia Monasteriensi Colonias "ad Rhenum 1872, nnpensis 

 M. Du Mont Schauburg. Catalogiis Stella-rum. 



I. Two volumes bound. 



II. Thirteen plates for hanging on the wall. 



Prof. E. Heis, Munster. 



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 Avith 

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

 stars of the 1st, 6th magnitude, those also of the 6th and 7th magnitude, 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 (sec 

 Results of Astronomical Observations at the 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 Avill 

 be able to judge whether in the course of centuries the sky has changed, 

 whether any of the stars get brighter or darker, whether some have disappeared, 

 or others come into view. 



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

 greatest accuracy, and to make the brightness of the different stars 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 celestial globe in 

 the Farnese 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 

 Hamstur (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. Prestel, 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, aud of the 

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



Prof. Dr. Prestel, Emden. 



1917a. Photograph of the Sun, by Mr. Rutherford, taken 

 with his triple combination. J. Norman Lockyer, F.R.S. 



1917b. Enlarged Photographs of the Sun, taken by M. 

 Janssen. J. Norman Lockyer, F.R.S. 



1917c. Photograph of the Sun, taken by Professor Win- 

 lock, by a simple lens of 40 feet focal length. 



J. Norman Lockyer, F.R.S. 



1918. Chart of the whole Celestial Sphere in epicycloidal 

 projection. Dr. F. August, Berlin. 



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



