136 ASTRONOMY FOR 1889. 1890. 



The zones were assigned to tlie sev^eral ])aiti(ipating as follows: 



NOirni. 



Helsiugfors... 



Potsdaui 



Oxford 



(Greenwich ... 



Paris 



Vienna 



Bordeaux 



'I'ouloiise 



Catania 



Algiers 



San Fernando 

 Chapnltepec. . 

 Tacubaya . ... 



Latitudi 



+ 60 

 f)'i 

 51 



ni 



48 

 4rt 

 44 

 4:5 



19 



+19 



9 



22 

 45 



28 



i:? 



r)0 

 :{7 

 :50 



48 

 27 

 2(; 

 24 



SOUTH. 



Rio de Janeiro 



Santiago 



Sydney 



Cape of Good Hope 



La Plata 



Melbourne 



Ko observatory in the United Stntes appears on this list. A bill was 

 introduced in Congress making an appropriation to enable the United 

 States Naval Observatory to undertake a share of the work, but the 

 bill failed to become a law. 



The committee decided that the field of the telescope available for 

 measurement should be 2° square; that the photographic plates em- 

 ployed (which are to be of plate glass) should be 160""" (6^ inches) 

 square and the series of reference lines 130'""' (5i inches) square with 

 the lines 5"'"' apart. 



Twelve test objects were selected, all of which are situated near the 

 equator, at intervals of about two hours of right ascension. In addition 

 to these, the Pleiades, Praisepe, and a group in Cygnus were selected 

 for the use of the more northern observatories. 



To fix the time of exposure so that the plates shall contain stars to 

 the eleventh mngnitude, it was decided to determine fiist the time nec- 

 essary to ])liot()graph a star of the 0.0 magnitude of Argelander's scale, 

 and thereby multiplying by 6.25 the time of exposure for magnitude 

 11.0 will be obtained. 



Three more numbers (3, 4, and 5) of the Bulletin du Comite Interna- 

 tional permanent pour I'Ex^cution Photographique de la Carte du Ciel 

 have been published. Among the many papers contributed to these 



