hypocaust ⪢⪢
http://qindex.info/i.php?x=11829
○○○ Bath ⪢⪢
Examples of hypocaust systems have been found all over former Roman territories but the best preserved examples are in Bath, England.
http://qindex.info/i.php?x=11835
○○○ gap ⪢⪢
Later hypocausts also included gaps between the walls so heat could flow throughout the house.
http://qindex.info/i.php?x=11839
  hypocaust
http://qindex.info/i.php?x=11822
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