PROCEEDINGS OF SECTION A. 



47 



Ci = - -1^1 oj^{s -a)e "^^ sin(wif + yi) + w2(s-?>)e ""' sin(w2^ +72) f 

 C2 =P2 ^ — — \ ~ f^i ^ "'' sill (wi ^ 4-^1) + W26 "* sin ((.>2< + ^2) f 



where 



2^2 



= ^^ = 6^iM as before ; and 



■K^2-^2 



s - b 



y^^^^-^;'' ^2= -4-^2^ -'. 



Cl 



_ 9 



- ^2 ,.~ '^> ^2 = 2-;;2 ^' 



a 



in whicli 

 and 





C- W2 



til Wo 



"1 = 7l - — J f'2 = 72 - ^^ 



Wj Wo 





/3i - ^j 



Wl 



/'2 = f2 



W9 



7.— A NEW VISCOMETER. 

 ^2/ Professor R. HosJcing, Royal Military College, Duntroon 



8.— THE lONISATION PRODUCED BY THE IMPACT OF 



SOLID BODIES IN AIR. 



By Professor Kerr Grant, University of Adelaide. 



9.— A PLEA FOR A MORE RATIONAL AND ACCURATE 

 USE OF 1VL4THEMATICS. 

 By Professor D. K. Picken. 



10.— DETERMINATION OF THE THERMAL CONDUCTIVITY 



OF GASES. 

 By Professor T. H. Laby, B.A. 



11.— THE NUMERICAL DATA OF RADIOACTIVITY. 

 By Professor T. H. Laby. 



