Lot 288
A collection of Barnes Wallis' lecture slides mainly about Dam Busters, bombs and targets in fitted numbered wooden boxes (81 slides in two boxes) Box W, 40 slides (5 slides cracked), box marked in chalk into four sections Section A: Four miscellaneous diagrams, one miscellaneous photo, two photos of original, almost spherical bouncing bomb Section B: Five photos, five drawings and a map relating to the Ruhr dams and the Dam Busters Section C: 14 photos of 617 Squadron's targets, some destroyed (including Tirpitz upside-down), a photo of a Tallboy bomb and two drawings relating to the Tallboy Section D: Five photos relating to the Ruhr dams and the bouncing bomb Box D, Diagrams, 41 slides Slides 1-26 Aerodynamics Slides 28-31 Stratospheric chamber Slides 33-34 Diagram, photo and blueprint of a German dam, possibly Mohne Slides 36-38 Diagrams of Tallboy effect on Bielefeld viaduct Slides 40-45 Diagrams for bombing coal mines, oil storage depots, tunnels, railway cutting or embankment  £300-400