Photocopy of notes by F J Wright on hyperbolic umbilic diffraction Photocopy of notes by Wright on hyperbolic umbilic diffraction. With a covering note by John Nye, dated 2007, stating that he had not seen these when he published a similar paper on the topic in 2006 [likely 'Evolution of the hyperbolic umbilic diffraction pattern from Airy rings' published in the Journal of Optics A]. [c.1979]-2007