`McCartney' microscope lamp with transformer, rheostat and one filter, by R. R. Beard Ltd., London, SE15, England, 1950-1955. `McCartney' microscope lamp with transformer, rheostat and filter 1950-1955
Transformer, metal, on metal trolley, by Westinghouse of U.S.A., early 20th century Transformer, metal, on metal trolley 1901-1930