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  2. Fire pit - Wikipedia

    en.wikipedia.org/wiki/Fire_pit

    Fire rings have no bottom, and are simply circles made of forged metal, stones, concrete, etc. which surround and contain a fire. Manufactured steel fire rings are available in various sizes to suit every need. [citation needed] When a fire is to be built somewhere such as on a patio or in a backyard, a fire pit or outdoor fireplace may be ...

  3. Fireplace insert - Wikipedia

    en.wikipedia.org/wiki/Fireplace_insert

    A fireplace insert [1] is a device that can be inserted into an existing masonry or prefabricated wood fireplace. Fireplace inserts can be fuelled by gas, wood, electricity, coal, or wood pallet. Most fireplace inserts are made from cast iron or steel. Fresh air enters through vents below the insert, where it then circulates around the main ...

  4. Fifth-wheel coupling - Wikipedia

    en.wikipedia.org/wiki/Fifth-wheel_coupling

    The coupling consists of a kingpin, a 2-or-3 + 1 ⁄ 2-inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel on the rear of the towing vehicle. As the connected truck turns, the downward-facing surface of the semi-trailer (with ...

  5. Piston ring - Wikipedia

    en.wikipedia.org/wiki/Piston_ring

    A piston ring is a metallic split ring that is attached to the outer diameter of a piston in an internal combustion engine or steam engine. The main functions of piston rings in engines are: Sealing the combustion chamber so that there is minimal loss of gases to the crank case.

  6. Engineer's Ring - Wikipedia

    en.wikipedia.org/wiki/Engineer's_Ring

    An example of the stainless steel Engineer's Ring issued by the Order of the Engineer The ring is worn on the little finger of the dominant hand.. The Engineer's Ring is a ring worn by members of the Order of the Engineer, an American fellowship of engineers who must be a certified Professional Engineer or graduated from an accredited engineering program (or be within one academic year of ...

  7. Ring circuit - Wikipedia

    en.wikipedia.org/wiki/Ring_circuit

    The ring starts at the consumer unit (also known as fuse box, distribution board, or breaker box), visits each socket in turn, and then returns to the consumer unit. The ring is fed from a fuse or circuit breaker in the consumer unit. Ring circuits are commonly used in British wiring with socket-outlets taking fused plugs to BS 1363. Because ...