Reviews a project that combined analytical study and experimental verification to investigate the effects of imperfections and secondary structures on the buckling collapse of pressure hulls. After an introduction on the project, section 2 describes the ring-stiffened models used, the introduction of out-of-circularity into the models, the instrumentation of the models, and the experimental results. Section 3 describes comparison of experimental and predicted results for the early linear response to loads. The non-linear behaviour and final collapse comparisons are described in section 4. Section 5 discusses the use of harmonic amplitude values to interpret out-of-circularity and to check design tolerances. The final section derives conclusions on the prediction methods used.

Celebrating our 9th year in publication! Each issue of the Bards and Sages Quarterly seeks to offer readers a unique collection of original speculative fiction tales from both new and established writers. In this issue: An interview with John J. Rust and Mark Gardner about their newest project, War of the Worlds: Retaliation. Original short fiction by Andrew Knighton, A.J. Flowers, Steven C Evans, Taylor Harbin, Walter G. Esselman, Steve Coate, Sean Garvey, PJ Keuning, Molly N. Moss, B.C. Nance, Eric Lewis, and Josh Pearce.