Places Where Gas Masks Are Necessary 



A gas mask worn by the photographer 

 enables him to take a picture of the 

 man who is shown at left below repairing 

 a leak in an ammonia tank. Dur- 

 ing the time the photograph was taken 

 choking fumes of ammonia were escap- 

 ing in great volume from the tank, which 

 is situated in a cold storage plant 



Photo? © Kadel and Herbi 



Repairing the ammonia tank, a task made 

 safer through the use of the gas mask. The 

 cylinder below the mask contains chemi- 

 cals which absorb all of the poisonous fumes 

 and allow only pure air to reach the lungs 



A chemist experimenting with a dangerous 

 combination of chemicals which give off poi- 

 sonous fumes. With the gas mask pro- 

 tecting his nostrils, he is able to approach 

 close enough to his work to watch it intently 



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