DR. MADDOX'S GERM COLLECTING APPARATUS. 

 Pig. 74. 



PLATE XX. 



Dr Martdox's spraratus for collecting germs and solid particles 

 suspended in tli atmosphere The air enters at a and through the 

 smaller fuunt-la above nd below, it passes through the narrow 



strikes against the thin glass placed imme 

 diately beneath This is smeared witl: 



The spring for re- 

 taining the thin 

 glass in position, 

 seen in section. 



Screwed pipe with fine extra nozzle foi 

 experiments wuh disinfectants, p 162. 



The thin glass on its plate with 

 holes around the circumference, 

 through which the air escapes. 



Tube and lamp for causing a draught through the apparatus 



wlien it is used in a room or confined space. The vane is 



. removed and the apparatus arranged vertically, p. 162. 



[To face page 162. 



