n 



r 



o 



\ 



■Semi-fransparent silica 

 S mm inside diameter 



Semi-transparent silica 

 /i mm inside diameter 

 IS mm outside « 



Loose asbestos fiber 



E 

 O 

 OO 



E^ 



B 



y m'/ i Wf<'4 



-Aiundum tube 

 •Semi-transparent silica 



■20 mm inside diameter 



34- mm outside 

 ■ Asbestos - macjnesia 

 pipe coverina 



■Asbestos hoard 

 Wooden shelf 



^ Transparent silica 

 tubes, 5 mm bore. 



E 

 E 



o 



WlSmm^ 

 Fig. 1. Silica-glass mercury still 



12 



