'Protecting Your Windows - a Sandbag Defence', Wills cigarette card, 1938.
© Science Museum / Science & Society Picture Library
One of a series of 'Air Raid Precautions' cards. This one illustrates how sandbags should be piled against a window to prevent the glas being shattered by the force of a bomb blast. Despite widely being regarded as a useful source of instruction, production of cigarette cards was halted during both World Wars due to shortages.