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2. Cupstone - Wikipedia

   en.wikipedia.org/wiki/Cupstone

   Early observers saw the processing of mast using stones, and one later recreation achieved similar results: nuts were placed, one at a time, on stone (an "anvil" stone) and then struck with a smaller "hammer" stone: "As nuts were cracked in this manner a pit developed in the lower stone; the pit deepened as additional nuts were cracked, and ...

3. Limepit - Wikipedia

   en.wikipedia.org/wiki/Limepit

   Burning chalk stone was performed in simple kilns in close proximity to where the chalk was found. Lime kilns were made by digging a round hole, three metres wide, two and a half metres deep. After the hole was dug, the chalk and fuel for a fire would be brought to it. Stones of chalk (limestone) would be arranged in a circular dome in the pit.

4. Fire pit - Wikipedia

   en.wikipedia.org/wiki/Fire_pit

   A fire pit. The defining feature of fire pits is that they are designed to contain fire and prevent it from spreading. A fire pit can vary from a pit dug in the ground (fire hole) to an elaborate gas burning structure of stone, brick, and metal. Certain contemporary fire pit styles include fire bowls that can either be set in the ground or ...

5. The 13 Best Fire Pits to Upgrade Your Patio - AOL

   www.aol.com/lifestyle/10-best-fire-pits-upgrade...

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6. Carved stone balls - Wikipedia

   en.wikipedia.org/wiki/Carved_stone_balls

   Carved stone balls are petrospheres dated from the late Neolithic, to possibly as late as the Iron Age, mainly found in Scotland, but also elsewhere in Britain and Ireland. They are usually round and rarely oval, and of fairly uniform size at around 2 + 3 ⁄ 4 inches or 7 cm across, with anything between 3 and 160 protruding knobs on the surface.

7. Spherical cap - Wikipedia

   en.wikipedia.org/wiki/Spherical_cap

   An example of a spherical cap in blue (and another in red) In geometry, a spherical cap or spherical dome is a portion of a sphere or of a ball cut off by a plane.It is also a spherical segment of one base, i.e., bounded by a single plane.