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  2. Prism lighting - Wikipedia

    en.wikipedia.org/wiki/Prism_lighting

    The human eye's response to light is non-linear: halving the light level does not halve the perceived brightness of a space, it makes it look only slightly dimmer. [3] [4] If light is redistributed from the brightest parts of a room to the dimmest, the room therefore appears brighter overall, and more space can be given a useful and comfortable level of illumination (see before and after ...

  3. Transom (architecture) - Wikipedia

    en.wikipedia.org/wiki/Transom_(architecture)

    In architecture, a transom is a transverse horizontal structural beam or bar, or a crosspiece separating a door from a window above it. This contrasts with a mullion, a vertical structural member. [1] Transom or transom window is also the customary U.S. word used for a transom light, the window over this crosspiece.

  4. Transom (nautical) - Wikipedia

    en.wikipedia.org/wiki/Transom_(nautical)

    Vertical transom and stern of a modern cargo ship. In some boats and ships, a transom is the aft transverse surface of the hull that forms the stern of a vessel. Historically, they are a development from the canoe stern (or "double-ender") wherein which both bow and stern are pointed. Transoms add both strength and width to the stern.

  5. Headlamp - Wikipedia

    en.wikipedia.org/wiki/Headlamp

    A light source (filament or arc) is placed at or near the focus of a reflector, which may be parabolic or of non-parabolic complex shape. Fresnel and prism optics moulded into the headlamp lens refract (shift) parts of the light laterally and vertically to provide the required light distribution pattern. Most sealed-beam headlamps have lens optics.

  6. Fanlight - Wikipedia

    en.wikipedia.org/wiki/Fanlight

    Fanlight at Montgomery's Inn in Toronto, Canada Hotel in Ariah Park, New South Wales, with its name in the fanlight. A fanlight is a form of lunette window, often semicircular or semi-elliptical in shape, with glazing bars or tracery sets radiating out like an open fan. [1]

  7. Pennsylvania Railroad class GG1 - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad...

    The traction motors were six-pole field, 400 volts, 25 Hz rated each at 385 hp (287 kW). The motors were frame-mounted using quill drives to the sprung driving wheels, providing a flexible suspension system across a relatively-long locomotive frame, which allowed full wheel weight to rest on the rail for good traction regardless of track condition.