
“…a cotton pad soaked in sodium carbonate and sodium thiosulphate which, tied over his nose and mouth, afforded protection against chlorine gas.”
(This is a piece in a series of drawings of various gas masks. See all of them over here.)

“…a cotton pad soaked in sodium carbonate and sodium thiosulphate which, tied over his nose and mouth, afforded protection against chlorine gas.”
(This is a piece in a series of drawings of various gas masks. See all of them over here.)