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2. Blackout (fabric) - Wikipedia

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

   The process of manufacturing blackout was invented by Baltimore-based Rockland Industries, [2] and involves coating a fabric with layers of foam, or 'passes'. A '2-pass' blackout is produced by applying two passes of foam to a fabric – first, a black layer is applied to the fabric, then a white or light-colored layer is applied on top of the black.

3. Blackout (wartime) - Wikipedia

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

   A blackout during war, or in preparation for an expected war, is the practice of collectively minimizing outdoor light, including upwardly directed (or reflected) light. This was done in the 20th century to prevent crews of enemy aircraft from being able to identify their targets by sight, such as during the London Blitz of 1940.

4. Window blind - Wikipedia

   en.wikipedia.org/wiki/Window_blind

   Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.

5. Blackout (broadcasting) - Wikipedia

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

   The Canadian Football League's constitution does provide the option for teams to black out games in their home markets in order to encourage attendance; at one point, the CFL required games to be blacked out within a radius of 120 kilometres (75 miles) around the closest over-the-air signal carrying the game, or 56 kilometres (35 miles) of the stadium for cable broadcasts (and, for the ...

6. Brownout (electricity) - Wikipedia

   en.wikipedia.org/wiki/Brownout_(electricity)

   A linear DC regulated supply will maintain the output voltage unless the brownout is severe and the input voltage drops below the drop out voltage for the regulator, at which point the output voltage will fall and high levels of ripple from the rectifier/reservoir capacitor will appear on the output.