Sectioned example of Joy's Assistant Cylinder for Slide Valves, 1889 (Ex.1897-56 Pr.) ( See diagram 1927-2035) Sectioned example of Joy's Assistant Cylinder for Slide Valves 1889
Series of examples illustrating growth of the Nernst Electric lamp Series of examples illustrating growth of the Nernst Electric lamp 1897-1903
Metal base or part from a Nernst Electric lamp Series of examples illustrating growth of the Nernst Electric lamp 1897-1903