Diagrams, Tay Bridge vibrations by J A [James Alfred] Ewing One page of four diagrams, labelled figures 2 and 4, showing diagrams drawn by Ewing's seismograph indicating vibrations felt during Ewing's investigations into the Tay Bridge during the passing of railway trains. Subject: Seismology Prints of these diagrams were published in volume 44 of the Proceedings of the Royal Society alongside the paper 'Seismometric measurements of the vibration of the new Tay Bridge during the passing of railway trains'. 1888