• 1890
  • 1900
  • 1910
  • 1920
  • 1930
  • 1940
  • 1950
  • 1960
  • 1970
  • 1980
  • 1990
  • 2000
  • 2011
PHOTOMETER SPHERE

Photometer Sphere (1952)

Footage of a large photosphere being used to test neon light bulb, Middlesex.