46 
GASEOUS DISINFECTION— 
A. Formaldehyd : 
a. Chemistry and physics. 
5. Sheet method. 
c. Generator — 
1. Knhn lamp. 
d. Regenerators without pressure — 
1. Trenner-Lee. 
2. Lentz. 
e. Regenerators with pressure — 
1. Autoclave. 
/. Heating paraform. 
g. Spraying. 
B. Sulphur dioxid (SO 2 ): 
a. Liquid sulphur dioxid. 
h. Burning sulphur, pot method, 
c. Sulphur furnace. 
C. Hydrocyanic acid gas. 
D. Chlorin gas. 
E. Ozone and oxygen. 
