\?)C} ASTRONOMY FOlf l.ssit. 1890. 



Thr zoiM's were assigued to the several parti ipating as follows: 



NOKTH. 



No observatory in the CnitiMl States api)ears()ii this list. A bill wa.s 

 introduced in ('(Migress 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 photo<>rai)hic plates em- 

 ployed (which are to be of plate ffhiss) should be 100""" (O.j inches) 

 s(puire and the series of reference lines 130"'"' (5^ inches) s<jnare with 

 the lines 5"'"' apart. 



Twelve test ol»jects were selected, all of which are situated near the 

 equator, at intervals of about two hours of ri<iht ascension. In addition 

 to these, the Pleiades, Pra^sepe, and a group in Cygiius were selected 

 for the use of the more northern observatories. 



To fix the time of ex])osure so that the plates shall contain stars to 

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

 essary to photograph a star of the 9.0 magnitude of Argelander's scale, 

 and thereby inultii)lyiug by C.25 the time of exposure for magnitude 

 11.0 will be obtained. 



Three mort' numbers (3, 1, and 5) of the BiiUitin du Comitr Interna- 

 tional perm an cut poMi TExecution Photograi)liique de la Carte du Ciel 

 liave been published. Among the many papers contributed to these 



