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  2. Fire pit - Wikipedia

    en.wikipedia.org/wiki/Fire_pit

    A fire ring is a construction or device used to contain campfires and prevent them from spreading and turning into wildfires. [citation needed] A fire ring is designed to contain a fire that is built directly upon the ground, such as a campfire. Fire rings have no bottom, and are simply circles made of forged metal, stones, concrete, etc. which ...

  3. Darvaza gas crater - Wikipedia

    en.wikipedia.org/wiki/Darvaza_gas_crater

    The early years of the crater's history are still being determined. [3] [4] Relevant records are either absent from the archives, classified, or inaccessible.[1] [3] Some local geologists have claimed that the collapse of a crater happened in the 1960s; it was set on fire only in the 1980s to prevent the emission of poisonous gases. [7]

  4. Osborne Fire Finder - Wikipedia

    en.wikipedia.org/wiki/Osborne_Fire_Finder

    The fire lookout notes the degrees on the graduated ring beneath the sight. Early Fire Finders were capable of a crude estimate of elevation based upon the level and elevation of the table, calculating distance and rough position of the fire by reference to any distinctive terrain features and by use of the scale shown on the map.

  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. Retaining ring - Wikipedia

    en.wikipedia.org/wiki/Retaining_ring

    A retaining ring is a fastener that holds components or assemblies onto a shaft or in a housing/bore when installed - typically in a groove - for one time use only. Once installed, the exposed portion acts as a shoulder which retains the specific component or assembly.

  7. Crater Rings (Idaho) - Wikipedia

    en.wikipedia.org/wiki/Crater_Rings_(Idaho)

    Crater Rings are adjacent, symmetrical volcanic pit craters in the Western Snake River Plain about eight miles northwest of Mountain Home, Idaho. They are one of few examples of volcanic craters in the continental United States. [1] The craters are at the summit of a broad shield volcano. The eastern crater is about 3000 ft across and 350 ft deep.

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