Smi-thsonian Report, 1910.— Beyer 



Plate 10. 



1. Workmen Equipped with Safety 

 Hood, Ready to Enter a Gaseous 

 Atmosphere. 



This is a type of equipment wliicli is used 

 largely "for rescue work in mines, and 

 has been provided for our gas engine 

 plants. 



2. Safety Hood, Rear View. 



The same air supply is breathed 

 over and over again, being con- 

 stantly purified and supplied 

 with the necessary oxygen. 



