The paper describes the construction and pressure-testing of fifteen cylindrical shells made by filling the space between two thin, steel, concentric membranes with a resin-glass composite. Their behaviour is compared with a previously published theory (1)†. The comparison is satisfactory over about two thirds of the length of the shell, with excellent agreement before the steel skins yield and good agreement with mean behaviour at higher pressures. All the shells remain totally stable after the steel skins have yielded and some achieve their full theoretical strength.
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