402 



Sf'Jcntip'c Intel liijcn ce. 



oV^us'at^'T 

 focal length of th 



t the image of the sun. The angula 

 should be 65-J-sii] !" = 0-0003 W, I 



an bo changed al will by simply v 



■ but a small part of the worJ- 

 of the Observatory, and since 1879 this has been mainly photo- 

 metric. The results are given under the heads: Double Stars: 

 Nebulae; Satellites of Saturn, Uranus and Xeptune; Satoliites o: 

 Mars, 1877 and 1879; Asteroids; Comets; Ocvultations. Tin 

 observations on Double Stars were mosth .mule under the diree 

 tion of Professor Winlock, but to those are added a lew others- 

 made by Professors \Y. C, and G. P. Pond, published by tin 



'(>> f/n /'/ '' iraphk Spectrum of Comet (Wells) /, 1*82; 

 bv William H, o.hns. , From the Proceeding of the Hoval 

 SomoU )— On tin- , w m» U .,f \\ ubu »d i\ . M 1} '. 1 , 1 obtained a 



taken throug] e slit, for comparison. 



The photograph shows a strung co.iihmm.s spectrum . ■xf.mdinuf 

 from aboul F to a little bcv-eei II. In this eoutinuous spectrum 



