Letters from Sir Charles Parsons to his brother, mainly concerning the development and testing of marine steam turbines; letters to Sir Joseph Larmor concerning Cambridge University business and other subjects; other letters.

Papers concerning Prof. W. Johnson's lecture 'The centennial year of Herbert Walker Swift' and its subsequent publication, letters and papers concerning a patent, correspondence of Mrs Maisie Swift after her husband's death, Swift's notes on plasticity, work by Swift's students.