A Description in non-technical Language of the diverse and wonderful ways in which chemical forces are at work and of their manifold application in modern life.
By permission of Siebe, Gorman & Co.
How a Man may Breathe Safely in a Poisonous Atmosphere
The mouth is connected with a breathing bag (carried on the chest) into which oxygen is
delivered from steel bottles shown on the back of the right-hand figure. The bag contains
also caustic soda to absorb the carbon dioxide exhaled from the lungs.