Both the French and the German shelters are family-type struc- tures, They are being tested at maximum pressure ranges far in excess of those used for testing the American shelters. Nine German and two French shelters are being tested. In addition there are tests of three isolated entrance-ways of French design. One French shelter is rectangular and one is cylindrical, while seven of the German shelters are rectengular and two are cylindrical, Vault Design Test Another project, sponsored and paid for by the Mosler Safe Company, was a test of a-reinforced concrete, steel-lined vault and a Standard steel safe door. The vault, 11 feet by 10 feet by 17 feet, was fully exposed above ground. Clcsure is effected by a ten-inch thick steel door. This test, to confirm the level of resistance of materials andstructures to a nuclear blast at close range, grew out cf the concern on the part of banks and insurance companies over protection of vital records and valuables. The cost, in terms of overall research and construction, exceeded 500,000. a Air Zero Lecators Civil defense operations, following an attack with nuclear weapons, would be facilitated if a network of suitable devices for indicating the position of the explosions were provided. Previous tests have demonstrated that a camera-type recording device is feasible. FCDA is financing the development of three different types of devices and numerous screen materials through the Eastman Kodak Company, the Bureau of Standards, and the Quartermaster Corps, Eighty prototype air zero locators are being tested under a variety of field concitions. Masonry Construction Unreinforced brick masonry structures were compared unfavorably with reinforced concrete structures in previous tests. The Structural Clay Products Research Foundation has developed a design which they claim is highly resistant to blast loads. This design and a number of wall panels were tested to determine resistence to nuclear blast, at the industry's expense. Door Tests This project is for obtaining criteria by which the design of commercial doors may be established for low blast pressures. Previous tests showed a need for reducing the damage to doors and eliminating the missile hazard resulting from doors becoming dislodged in low pressure blast areas where otherwise damage would be very minor. Doors and hardware have been designed utilizing commercial door manufacturers! components. Ten test doors were mounted in cells for this experiment. - 70 - "GE s te Gg \ C °