1) Ancient invention 2) Ancient Roman architecture
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1) Furnace
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https://www.crosswordclues.com/clue/hypocaust
A hypocaust (Latin hypocaustum) was an ancient Roman system of underfloor heating, used to heat houses with hot air. The word derives from the Ancient Greek hypo meaning `under` and caust-, meaning `burnt` (as in caustic). The Roman architect Vitruvius, writing about the end of the 1st century B.C., attributes their invention to Sergius Orata....
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http://en.wikipedia.org/wiki/Hypocaust
Roman central heating
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space under floor for heating by hot air
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• (n.) A furnace, esp. one connected with a series of small chambers and flues of tiles or other masonry through which the heat of a fire was distributed to rooms above. This contrivance, first used in bath, was afterwards adopted in private houses.
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http://thinkexist.com/dictionary/meaning/hypocaust/
in building construction, open space below a floor that is heated by gases from a fire or furnace below and that allows the passage of hot air to ... [2 related articles]
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http://www.britannica.com/eb/a-z/h/92
Floor raised on tile piers, heated by hot air circulating beneath it. It was first used by the Romans for baths about 100 BC, and was later introduced to private houses. Hypocausts were a common...
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http://www.encyclo.co.uk/local/20688
A raised floor in Roman buildings. This was supported by piled pieces of tile or stone columns. It allowed the circulation of air, (often warmed in the case of bath-houses and villas), throughout the building.
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Roman central heating It works by hot air flowing through gaps between walls and flooring
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The Roman used the hypocaust system as a form of central heating for heating rooms and also the water in bath houses (thermae). It is thought to have been developed in the 1st century BC by Gaius Sergius Orata. The underfloor heating system had hot air from basement fires flowing between the brick tile (bessales and bipedales) or concrete columns (…...
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Hyp'o·caust noun [ Latin
hypocaustum , Greek ...; ... under + ... to burn: confer French
hypocauste .]
(Anc. Arch.) A furnace, esp. one connected with a series of small chambers and flues of tiles or other masonry through which the heat of a fire was distributed to rooms above. This...
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http://www.encyclo.co.uk/webster/H/82
In ancient Roman baths, rooms, etc, a hypocaust was an arched chamber in which a fire was kindled for the purpose of giving heat to the rooms above it. The heat was distributed by means of tubes of earthenware and hollow passages under the floor, the heat rising through the floor and heating the room above, hence its popular name of under-floor hea...
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http://www.probertencyclopaedia.com/browse/TH.HTM
hypocaust In architecture, an open space below a floor to allow the passage of hot air and smoke in order to heat the room above. This type of heating was developed to a high degree by the Romans who used it not only in the warm and hot rooms of the baths, but also almost universally in private houses in the northern provinces. Many examples of s...
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Roman method of central heating: The floor was raised, usually on pilae, and flue-tiles acting as 'chimneys' were built in the thickness of the walls. The draught created by these flues enabled hot air to be drawn from the stoke-hole on the right in fig 4), where brushwood or other fuel was burnt, to circulate under the floor, and to escape up the ...
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https://www.encyclo.co.uk/local/20434
Floor raised on tile piers, heated by hot air circulating beneath it. It was first used by the Romans for baths about 100 BC, and was later introduced to private houses. Hypocausts were a common feature of stone houses in the colder parts of the Roman empire, but could not be used in timber-framed buildings. Typically the house of a wealthy per...
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https://www.encyclo.co.uk/local/21221
a hollow space or system of channels in the floor or walls of some ancient Roman buildings that provided a central heating system by receiving and distributing the heat from a furnace.
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https://www.infoplease.com/dictionary/hypocaust
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