Firemen demonstrate the use of a new foam to put out difficult fires.
Full title reads: "Northolt. Smother it out. Fire experts from all over the country see remarkable demonstration of latest method of fighting the flames."
Northolt Aerodrome, Greater London.
A man demonstrates a new fire fighting technique. He uses a hose to spray foam onto a fire burning in a trough.
Large plumes of dense black smoke rise from another fire. Firemen force foam through pipes onto the fire and put it out.