This investigation was undertaken to determine the relative resistance of different types of commercial windows and glazing to an atomic blast, also to determine what degree of protection from flying glass is provided by Venetian blinds, insect screens, and wire netting. Various types of windows glazed with plastic and different kinds of glass were installed on four sides of a test structure, which was exposed to the blast of an atomic weapon. The photographic record and detailed description of the windows before and after the blast included in this report provide a basis for evaluating comparative damage.