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2. Sconce (light fixture) - Wikipedia

   en.wikipedia.org/wiki/Sconce_(light_fixture)

   The sconce is a very old form of fixture, historically used with candles and oil lamps. They can provide general room lighting, and are common in hallways and corridors, but they may be mostly decorative. [1] A sconce may be a traditional torch, cresset, candle or gaslight, or a modern electric light source affixed in the same way.

3. Signal lamp - Wikipedia

   en.wikipedia.org/wiki/Signal_lamp

   Signal lamp training during World War II. A signal lamp (sometimes called an Aldis lamp or a Morse lamp [1]) is a visual signaling device for optical communication by flashes of a lamp, typically using Morse code. The idea of flashing dots and dashes from a lantern was first put into practice by Captain Philip Howard Colomb, of the Royal Navy ...

4. Barque - Wikipedia

   en.wikipedia.org/wiki/Barque

   Three-masted barque (US Revenue Cutter Salmon P. Chase, 1878–1907) Three-masted barque sail planA barque, barc, or bark is a type of sailing vessel with three or more masts of which the fore mast, mainmast, and any additional masts are rigged square, and only the aftmost mast (mizzen in three-masted barques) is rigged fore and aft.

5. Sodium-vapor lamp - Wikipedia

   en.wikipedia.org/wiki/Sodium-vapor_lamp

   The end caps of the arc tube would get as hot as 800 °C (1,470 °F) in operation, then cool to room temperature when the lamp was turned off, so the electrode terminations and arc tube seal had to tolerate repeated temperature cycles. This problem was solved by Michael Arendash [8] at the GE Nela Park plant. The first commercial high-pressure ...

6. Deck prism - Wikipedia

   en.wikipedia.org/wiki/Deck_prism

   Before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps—all dangerous aboard a wooden ship. The deck prism laid flush into the deck, the glass prism refracted and dispersed natural light into the space below from a small deck opening without weakening the planks or becoming a fire hazard.

7. Compass rose - Wikipedia

   en.wikipedia.org/wiki/Compass_rose

   The following table gives a rough equivalence of the classical 12-wind rose with the modern compass directions (Note: the directions are imprecise since it is not clear at what angles the classical winds are supposed to be with each other; some have argued that they should be equally spaced at 30 degrees each; for more details, see the article ...