Intelligence and Miscellaneous Articles. 291 



sary, since the K lines were not in the field of view at the 

 same time as the Li line. The mean values taken for the 

 wave-lengths of the Al lines used for reference were 7042*5 

 and 7057 "9 respectively. Five sets of measurements were 

 made and the wave-lengths obtained as before. They were 

 found to be : — 



6828-3) 



6842-6 V with reference to Li 6708-1 and Al 7042*5, 



6928-3J 



6828-2) 



6842-5 V with reference to Li 6708'1 and Al 7057*9. 



6928-2 j 



The following table gives the mean values for the wave- 

 lengths of the aluminium-lines and their relative intensities 

 approximately, putting the intensity of the lithium-line as it 

 appeared in the same field of view as 10. 



-re,- , ., Relative intensity Oscillation-frequency 



W «WP— lPT10*tll ■ 



D ' and character. reduced to vacuo. 



6828-2 4 sharp. 14641 



6842-6 4 sharp. 14610 



6928-2 2 nebulous. 14430 



7042-5 6 sharp. 14195 



7057-9 5 sharp. 14165 



The line 7057-9 is probably double, the two components 

 being very near together, but no accurate measurements were 

 obtained. A large Huhmkorff-coil by Apps, giving a 10-inch 

 spark, was used in these determinations, also a large leyden 

 jar. 



Before concluding I must express my thanks to Professor 

 Schuster for his valuable suggestions and the interest he has 

 taken in the work. My thanks are also due to Mr. A. T. 

 Stanton for the kind assistance he has rendered in working 

 with the grating, and for many useful hints. 



The Owens College, 

 July 15, 1897. 



XXXIX. Intelligence and Miscellaneous Articles. 



OBSERVATIONS ON LATIMER CLARK'S STANDARD CELL WHEN 

 CLOSED. BY THEODOR WULF. 



r pHE Author observes the tension at the terminals of closed 

 •*- normal elements by connecting up a condenser, and then dis- 

 charging it through a galvanometer. By using Hicke's apparatus 

 these observations can be made for very short intervals after 



