274 MR. G. KNOTT ON THE VARIABLE STAR R VULPECULiE. 



The star b is variable to the extent of some few tenths 

 of a magnitude, and may therefore with advantage be re- 

 jected as a comparison star ; ^ is a double star, the mag- 

 nitude assigned above being that of the two components 

 seen as one star. 



I cannot close this communication without gratefully 

 acknowledging the courtesy and kindness of Mr. Baxendell 

 in freely communicating to me his own methods, and in 

 affording me all necessary explanations in cases of doubt 

 or difficulty. It is to be hoped that the time is not far 

 distant when the best methods of procedure in this branch 

 of the science will find a place in our textbooks of practical 

 astronomy. 



Mean Light-curve of E Vulpeculse, as derived from the 



observations at the "Woodcroft Observatory 



in the years 1861-1865. 



MAC 



S'o 



9.0 



/o-o 

 //■a 



/Z'O 

 /3'0 









J 1 X 



"^ 





\ — 



- 



. y^ 











• 



. 



/ 



/ 



/ 





\ 



\ 



N 



\ 



: 



• 



/ 



/ 









\ 



- 



'-^ 



_3 ! 1 . I 



1 f-. 



I » 1 









10 ZO 30 i.O SO 60 70 So 90 /OO //O /&0 /30 



Ojtys. PAYS,. 



