High pressure mercury vapour lamp
circa 1951
Osram high pressure mercury vapour lamp
circa 1945
Osram mercury vapour lamp
circa 1940
mercury vapour lamp
Mercury vapour tube in letter
Pope's Electric Lamp Co. Ltd Elasta mercury vapour lamp
circa 1945
mercury vapour lamp
circa 1975
British Thomson - Houston Co. Ltd Mazda MA/V mercury vapour lamp with fitting
circa 1945
mercury vapour electric lamp
1943
MA/V mercury vapour lamp
circa 1946
mercury/tungsten light bulb
circa 1970
Mercury vapour electric lamp made by Whouse Cooper Hewitt
1915
Mercury vapour electric lamp
1900