90 Mr. Pogson on the Madras Celestial Survey. 



plated opposition portions elsewhere provisionally allotted. 

 It is as well at once to disclaim any such intention on my 

 own part. The scale of projection, and as a matter of course 

 the magnitude of the stars in the Bonn charts, will be most 

 strictly adhered . to, but certain other points of departure 

 appear to me desirable ; and having had more than a dozen 

 years' practice in every detail of celestial chart- work, (at first 

 under Mr. Hind himself, the chief English authority in all 

 such matters, ) I feel perfectly justified in adopting my own 

 methods and arrangements for the accomplishment of the 

 heavy labour before me. While gratefully and eagerly 

 profiting by tire able counsel afforded me by Professor Arge- 

 lander, Mr. Hind, and others I may see fit to consult, un- 

 sought recommendations from inexperienced hands will be 

 utterly disregarded, and viewed only as intrusive and un- 

 welcome, from whatever source they may emanate. 



The following is a brief outline of the scheme of the Mad- 

 ras Southern Survey. 



Number and Arrangement. — The charts will be seventy- 

 nine in number ; each only half the size of one of Arge- 

 landers. They will overlap one degree in declination at 

 the southern limit, and the same quantity forward in 

 right ascension, but not at the opposite edges. Dividing 

 the whole hemisphere into five principal sections, the ar- 

 rangement will be as follows : 



Chart 

 Number. 



Limits of 

 South Declination. 



Width 

 in R. A. 





0 0 



h. m. 



1 to 24 



0 to 21 



1 4 



25 to 48 



20 to 41 



1 4 



49 to 66 



30 to 61 



1 24 



67 to 78 



60 to SI 



2 4 



79 



One circumpdlar chart of 10° radius. 



