Bethlehem Steel Company sponsors this industrial film making the case for steel-framed construction in earthquake country. Animated drawings trace how seismic forces originate deep inside the earth and travel outward to the surface, while footage of collapsed buildings and cracked streets shows what that energy does to masonry and unreinforced structures. The film explains how engineers measure quake intensity and why some buildings shake apart while others nearby remain standing, then argues that steel frames flex with the ground rather than fighting it, making them less likely to fail. Made before plate tectonics theory was established, the film's account of what triggers an earthquake reflects the seismology of its era rather than current geology, though the engineering argument for steel over rigid masonry holds up as a piece of period industrial persuasion. It functions as both a technical primer and a sales pitch, framed around the two things that determine whether a building survives a quake: material and design.