the a. Particles of Radium. 331 



In fig. 2 are shown the results of some o£ our experiments 

 of this kind on other metal films. All do not show the same 

 regularity as the silver : for we have found great difficulty 

 in obtaining uniform films in the majority of cases. The 





r 



3 



c 



H +* 



E y**] 



■2 



i 





* < 



n p** 





















k 







4 





k 



















i \ 











h 



f 



\ 



; 5 



















f 



$ 







* 1 



f 



1 



/I 



















i/ 



"~*p 



***** 





K 



" -^ 





/ 5 

















fr 



<' ! 









1 



30 



> 





















f 



1 



/ 







r 



j 



c. 





y CJ1 









f 





f 



/ 

















'} 



* 1 













% 



/ 













T ^ 





1 



1 



+ 









I 



; 





'b 













;oj<5 





'U 



^ 



l 









1 





; 



1 













71 



i 



1 -i 









* 





* 



• 



£ 



3 













P*** 







5s 







*' 





* 



', 











•fr* 



*■«*» 



jj 



*Nc 



f 











i 



f 















^ 



















I 















J 



















ib 















i 















;t 















o 





















4 



































n 



i 



i 



H 



i 



^ 







< 



n 





t 























1? 



--x — 



f— x- 



k -* 





-K 



•* 



















1 



As 



^ 



^ 





















**' 



.*' 









III 



*s 































8 















rolls used by the jewellers are not fine enough to give perfect 

 results, and we believe there is no goldbeater in Australia at 

 present. Nevertheless the metal workers have managed to 

 roll for us films of gold, platinum, and copper which have 

 given us fair results ; aluminium leaf was procurable and 



