Educational (mostly) item telling us about the history of fireplaces and the effect of heat on different substances.
Story teaching us about fireplaces through the ages and showing experiments using heat on different substances.
Title reads: "HOT STUFF".
Various shots illustrate different ideas of 'warmth' - a glamorous woman in a white fur coat and a man toasting his feet before an open fire. Some illustrations show early fires in homes and the invention of chimneys and smoke vents, called 'Louvers'. Various shots of louvers at Staples Inn, London.
Several experiments show the effect of heat on different metals and substances, including applying heat to a sulphurous mixture, making 'Pharaoh's Snakes' rise up from the laboratory bench - weird! A demonstration of an electric furnace shows cast iron being melted. A jokey final shot of an electric oven, where footage of a glamour girl is superimposed to look like she is inside it.