Series of examples illustrating growth of the Nernst Electric lamp
Component machined on Molins system 24 unit
Series of examples illustrating growth of the Nernst Electric lamp
Series of examples illustrating growth of the Nernst Electric lamp
1897-1903
Series of examples illustrating growth of the Nernst Electric lamp
1897-1903
Series of examples illustrating growth of the Nernst Electric lamp
Four examples of heliwire
2 examples of Paget reflection colour process.
Sectioned example of Joy's Assistant Cylinder for Slide Valves
1889