Research into flammable materials is carried out at Elstree in Hertfordshire.
M/S's as a man sets fire to a pile of wood shavings. C/U stopwatch. M/S of man checking the monitoring instruments. M/S's of the blazing shavings. A man looks through the window at the fire, others observe and write data on pad. C/U onlooker. C/U piece of equipment on tripod. M/S as the fire spreads through the room. C/U man checking fire on instruments. M/S building with smoke and flames coming out of windows. C/U wall on fire. M/S as the roof collapses. M/S of woman at panel, C/U indicator, C/U as she turns the dial. C/U of the fire.