Қыздырылған таспен су жылыту және археологиялық тұрмыстық қалдықтар

Heated stone used to heat water
any novel, play, opera, film, or other creative work of dubious literary or artistic merit, whose main purpose was to pay for the creator's daily expenses

In archaeology or anthropology, a pot boiler or cooking stone is a heated stone used to heat water typically by people who did not have access to pottery or metal vessels.

The term refers to a stone used to move heat from a fire to a vessel to raise the temperature of water in the vessel, including for cooking. The stone is heated in a fire or in embers. When hot enough, the stone is transferred into a vessel of water to heat the contents. The vessel may be metal (though this is uncommon, metal normally being tough enough to take direct heat from a fire) or pottery which is not of good enough quality to be directly exposed to the heat of the fire or a wooden trough. Such stones can be recognized because the repeated exposure to the heat of the fire followed typically by rapid chilling in water leads to great thermal stress on the stone's fabric due to the thermal expansion and contraction. This typically leads to partial glazing of the stone's surface and a fine network of cracks on the stone's surface (often described as "crazing"). Eventually the stone shatters. Individual fragments may be re used until it becomes infeasible to manipulate the stone into and out of the fire, at which point the fragments are discarded and a new pot boiler (or many new ones) are acquired. Often the broken pot boilers are discarded into middens or domestic waste deposits, which on long established sites can amount to many tonnes of material. Reuse as building material is not impossible, but the typical small size of the fragments hinders this use.

Surface "crazing" is not restricted to pot boilers hearth stones and the surrounds of fireplaces may also show the same structure. However, since a pot boiler needs to be manipulated into and out of the fire (typically in anthropological observations, using sticks of green wood) at arm's length, they start off weighing up to several kilogrammes, and shrink by fragmentation ; hearth stones and chimney liners are typically larger.