Leon Douglass - Selected Inventions

Selected Inventions

  • Slot attachment for phonograph (1889)
  • Spring-mounted motor to eliminate storage batteries in Edison phonographs (1891-1893)
  • Duplication process for phonograph cylinders (early 1890s)
  • Semi-cabinet, stand, record cabinet for phonograph (September 1903-December 1904)
  • First successful subtractive color movie process (1916)
  • Triple-scene dissolve movie camera (1921-1922)
  • Spring-actuated cigarette lighter (1924)
  • Zoom lenses
  • anamorphic lens for wide-angle filming
  • Special-effects movie cameras
  • Underwater cameras
  • Underwater "flashlight"

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