Four discs with white start-marks; one with Walturdaw label; one with Mendel synchroniser label. Gramophone records synchronised for Walturdaw soundfilm system
Maintenance and repair records for Class 40 locomotive number 40155 (D355), including details of the repair after its collision with locomotive no 40117 Class 40 locomotive no 40155
Three records of gravity determinations made in the Atlantic Ocean, by Prof. Felix Andries Vening Meinesz, 1932 Three records of gravity determinations made in the Atlantic Ocean 1932
Atmospheric electricity records of potential gradient varying between positive and negative, Kew Observatory, 1909-1910 Atmospheric electricity records of potential gradient varying between positive and negative 1909-1910
Atmospheric electricity records of varying positive potential gradient at Kew Observatory, 1909-1910 Atmospheric electricity records of varying positive potential gradient at Kew Observatory 1909-1910
Atmospheric electricity records made with Water Dropper and Dale Zalek electrometer at Eskdalemuir Observatory, 1910 Atmospheric electricity records made with Water Dropper and Dale Zalek electrometer at Eskdalemuir Observatory 1910