making a minute Suwei/ of the Heavens. 4-9 



intended sheet, must be estimated by the eye, as correctly as 

 possible, and be inserted therein. And it must be observed 

 that the stars of the chart must be such as can be seen under 

 favourable circumstances 'with one of Fraunhofer's comet- 

 seekers of 34 lines aperture, and a magnifying power of 10 

 times. 



6°. When stars stand too closely together to be separated 

 in the drawing, their magnitude only need be delineated, and 

 the number of them indicated by an equal number of lines 

 underneath it, as in the pattern sheet, 19 h 29 m and +11° 55'. 

 Where two stars are found double-stars, i. e. such as are not 

 above 15" or 20" distant from each other, they should be 

 distinguished by such distance being mentioned : ex. gr. at 

 19 h S2 m and +10° 12'.* 



7°. The sheet thus far advanced must be frequently com- 

 pared with the heavens, partly for the purpose of discovering 

 the changes that may have occurred during the drawing, and 

 partly also for the purpose of finally fixing the magnitudes 

 which the observer may be disposed to give to the stars. It 

 will perhaps not be possible to notice in the drawing the mi- 

 nute distinctions between the magnitudes of the smaller stars 

 marked on the pattern sheet, such as the 9th and (9'10)th 

 magnitude, nor will it be essentially necessary. 



One may be convinced by the pattern sheet (which repre- 

 sents one of the most starry parts of the heavens), that it is 

 possible to attend to all these rules f : and that the great mul- 

 titude of stars, marked upon it in the manner they are repre- 

 sented, neither crowd the space, nor render a general review 

 difficult. To name and describe in such charts either the con- 

 stellations and their limits, or single stars, would be both use- 

 less and injurious. 



The Academy have appointed a Committee, consisting of 

 Messrs. Ideler, Oltmanns, Dirksen, Encke, and Professor 

 Bessel of Kiinigsberg. And whoever is disposed to under- 

 take the execution of a sheet, should apply to any one of the 

 members of that Committee, who will point out to him a por- 

 tion not yet undertaken by others. Such a district will re- 

 main open for him during two years ; and if, after that period, 

 he cannot show to the Committee that he has made some con- 

 siderable progress in it, it will be transferred to another. 



As soon as any sheet is completed it must be sent to the 



* See the preceding note. 



f [The greatest number of stars in any one of the squares in the pattern 

 sheet is 16, and they are all perfectly distinct, even with the distinguishing 

 marks attached to them.— Sec] 

 Vol. 68. No. 339. July 1826. G Com- 



