'Window Protection Against Blast', Wills cigarette card, 1938.
© Science Museum / Science & Society Picture Library
One of a series of 'Air Raid Precautions' cards. This one illustrates an uncovered window glas being shattered by the force of a bomb blast and how this has been prevented by placing a wire mesh grid over the other pane. These include whitewash, shutters, cushions, a thick blind and finally a grid to be screwed to the frame. Despite widely being regarded as a useful source of instruction, production of cigarette cards was halted during both World Wars due to shortages.