Correspondence and papers regarding the preparations for Airy's lectures at the Royal School of Naval Architecture and Marine Engineering on magnetic errors, compensations and corrections. The volume includes texts, notes, annotations and corrections of Airy's lectures to the students; the syllabus for the course of lectures; plans of the old lecture theatre at the South Kensington Museum; instructions to W. Carpenter, J. Simmons and W. Simms for demonstration models; and various points of information and equipment for the lectures. The correspondents include J. Woolley, E.S. Poole, H. Cole, F.J.O. Evans, J.T. Towson and J. Tyndall.