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2. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   An overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement ...

3. Things Boomers Took for Granted That are Obsolete Now

   www.aol.com/things-boomers-took-granted-obsolete...

   Overhead Projectors. Early 1960s-2015 ... 1967 AMC Ambassador with a reclining front bench seat in a light blue green color. ... Near the end of World War II, ...

4. Enlarger - Wikipedia

   en.wikipedia.org/wiki/Enlarger

   All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat [citation needed] could be used in both camera and enlarger.

5. Arthur Lyon & Co - Wikipedia

   en.wikipedia.org/wiki/Arthur_Lyon_&_Co

   Arthur Lyon & Co Ltd. was a company based in London, England founded by Arthur Anderson Lyon M.I.Mech.E. (1876–1962). Arthur Anderson Lyon was an engineer and inventor who appears in the patent records in 1911 with a portable signalling device, [1] but by mid-1916 his inventions move from signalling lamps to electric generators and batteries.

6. Bell & Howell - Wikipedia

   en.wikipedia.org/wiki/Bell_&_Howell

   35mm filmstrip projectors; Overhead presentation projectors (all models) Stereo cameras and stereo slide projectors through its TDC subsidiary; Slide Cube Projector, circa 1970; In 1934, Bell & Howell introduced their first amateur 8mm movie projector, in 1935 the Filmo Straight Eight camera, and in 1936 the Double-Run Filmo 8.

7. Liquid light show - Wikipedia

   en.wikipedia.org/wiki/Liquid_light_show

   Light from a liquid light show, being projected behind a guitarist Layers of colored mineral oil and alcohol move over the projector lens and produce changing color patterns. Liquid light shows (or psychedelic light shows ) [ not verified in body ] are a form of light art that surfaced in the early 1960s as accompaniment to electronic music and ...

8. Yehudi lights - Wikipedia

   en.wikipedia.org/wiki/Yehudi_lights

   British researchers had found that the amount of electrical power required to camouflage an aircraft's underside in daylight was prohibitive; and that externally mounted light projectors (following the Canadian approach) unacceptably disturbed the aircraft's aerodynamics. [3] Yehudi lights were tested in B-24 Liberators from 1943.

9. Blackout (wartime) - Wikipedia

   en.wikipedia.org/wiki/Blackout_(wartime)

   A blackout curtain used in Auckland, New Zealand during World War II. Lights can simply be turned off or light can sometimes be minimized by tarring the windows of large public structures. In World War II, a dark blackout curtain was used to keep the light inside. Tarring the windows can mean a semi-permanent blackout status.