from Chemical and
Important objectives of testing biological and chemical weapons include devising body suits and face masks to protect soldiers from the effects of exposure to pathogens and toxic chemicals, and creating drugs and vaccines to counter the effects of CBWs or to prevent disease.
Just as the first uses of chemical and biological weapons date back several centuries, so do the first attempts at protection against chemical and biological agents. Leonardo da Vinci once designed a mask that was simply cloth dipped in water. To protect themselves from the plague, scientists in the 1600s used cone-shaped masks that resembled birds' beaks. The cones were filled with various spices and herbs.
In 1849, inventor Lewis P. Haslett received a U.S. patent for his Lung-Protector, a wool mask dipped in water. Shortly thereafter, various masks were devised that were made out of rubber and used charcoal as a filtering