Correspondence, letters M-W, regarding pendulum experiments at Harton, featuring, among others, Col. E. Sabine, the Revd R. Sheepshanks, W. Simms and Dr W. Whewell. The volume also includes Airy's hotel bills, E. Dunkin's book of expenses and journal, drawings of one of the pendulums as mounted, a printed copy of a memoir of the Royal Society (with map and diagrams), a lecture by Airy given in the Central Hall of South Shields, and an extract from 'Punch'.