Box labelled "Corder 1950-181 Harmonograph (spares)" filled with accessories for Corder's Harmonograph. Including: 37 brass gearwheels, drawings, a notebook, ruler, pens and brass components for chronograph.

Corder was Professor of Composition at the Royal Academy of Music from the 1880s. He also devised a harmonograph, an instrument which produces patterns by combining the motion of two pendulums. Corder’s harmonograph had extra facilities: the drawing table could rotate and move in a straight line. Corder ordered his drawings carefully, starting with the simple Lissajous figures. He used musical terms such as augmentation and diminution to describe the variations he could produce.