Item title reads - Hextable.
M/S as a mother walks up a street with her gas mask on. Various shots of her pram which has a gas mask container to filter the air and a covering with glass panel so the baby can see out. M/S of an old motor horn bulb on the back which expels the old air and sucks in the new. C/U of its inventor Mr F. W. Mills. M/S as the covering is lifted up and the baby taken out.