From verso of the card: "In the event of an air raid, steel splinters and fragments from high explosive bombs may cause many casualties. . . . The picture shows three types of wall (including methods of improvisation) which will afford protection. The first . . . is a dry wall, 13 1/2 in. thick, built of brick. The second . . . consists of broken brick, rubble or shingle piled 2 ft. thick and held between sheets of corrugated iron. The third . . . is made by filling boxes with these materials and piling them one above the other."