Scope and Contents *This item is currently restricted for health and safety reasons.*Correspondence with J.F. Campbell concerning sunshine recordings, including traces on green card from a solar-recording instrument and diagrams, 1881-1883.Correspondence with D. Winstanley, 1881, concerning his instrument for recording the duration and intensity of sunshine, including:1. 'A facsimile of a record of the duration of sunshine made by the Apparatus Winstanley'.2. 'Winstanley's...