"Fire extinuishers often contain a device for generating carbon dioxide rapidly, as by mixing sulphuric acid (b), or alum solution with sodium carbonate (a)." -Brownlee 1907
Brownlee, Raymond B., Fuller, Robert W., Hancock, William J., Sohon, Michael D., Whitsit, Jesee E. First Principles of Chemistry (Boston: Allyn and Bacon, 1907)
