Note:  Do not rely on this information. It is very old.

Fire Extinguishers

Fire Extinguishers. Various forms of fire extinguishers have at times been devised and patented. Most consist of vessels charged with solu- tions which upon heating evolve large quantities of gases which do not support combustion, i.e. do not allow other substances to burn in them, such as carbonic acid, C0.2, sulphur dioxide, SO", etc.