Photograph (Early Gelatine Print) of the Production Model of F. J. Jervis-Smith's Tram Chronograph, by Henry W. Taunt, Oxford, c.1898

Early gelatine print. The final production model of the tram chronograph invented in 1888 by the Oxford physicist Frederick J. Jervis-Smith (1848-1911), produced commercially in this form by Elliott Brothers from 1897 (the 1888 and 1890 laboratory prototypes are seen in photographs 12885 and 12888). It stands on three legs on a table or bench, and shows the carriage with wheels and a smoked glass plate, at the right of which are the electromagnetic styli on a separate stand. Glue stains all over the back of the photograph, and a modern identifying inscription, imply that it has been removed from a mount or frame. Other photographs of Jervis-Smith's tram chronograph are 12885 to 12888.