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2. Joel Spira (businessman) - Wikipedia

   en.wikipedia.org/wiki/Joel_Spira_(businessman)

   Joel Solon Spira (March 1, 1927 – April 8, 2015) was an American inventor, entrepreneur, and business magnate.. He invented a version of the light-dimmer switch for use in homes around the United States and led his Lutron Electronics Company into the production of lighting controllers.

3. Lustron house - Wikipedia

   en.wikipedia.org/wiki/Lustron_house

   Westchester Deluxe 2-bedroom house. Arguably the most popular of the Lustron homes was the two bedroom, 1,021 square feet (94.9 m 2) "Westchester Deluxe" model.In total, there were three "models" of Lustrons: the Westchester, Newport, and Meadowbrook.

4. Waveplate - Wikipedia

   en.wikipedia.org/wiki/Waveplate

   In the plate, the parallel wave propagates slightly slower than the perpendicular one. At the far side of the plate, the parallel wave is exactly half of a wavelength delayed relative to the perpendicular wave, and the resulting combination is a mirror-image of the entry polarization state (relative to the optic axis).

5. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   3 Australian light switches and a "neon" indicator—in a 4-gang wall-plate. The lower switch is in the "on" or "down" position. Two Australian rocker switches (disassembled), together with a cutaway view, and a view of the switch connections An Australian architrave-mounted 2-gang switch plate and switches.

6. Crossbar switch - Wikipedia

   en.wikipedia.org/wiki/Crossbar_switch

   The switch is operated manually with metal pins that create a connection between the horizontally and vertically arranged bars. [1] In electronics and telecommunications, a crossbar switch (cross-point switch, matrix switch) is a collection of switches arranged in a matrix configuration. A crossbar switch has multiple input and output lines ...

7. Railroad switch - Wikipedia

   en.wikipedia.org/wiki/Railroad_switch

   A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.