Illustrated Companion to the Latin Dictionary/Hypocausis

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

HYPOCAU'SIS (ὑπόκαυσις). A furnace with flues running underneath the pavement of an apartment in a private house or set of baths, for the purpose of increasing the temperature of the air in the chamber above. (Vitruv. v. 10. 1. and 2.) It is very plainly shown in the annexed engraving (Hypocausis/1.1), representing the sectional elevation of a bath-room, discovered in a Roman villa at Tusculum; the small arch on the left shows the mouth of the furnace (propnigeum), over which are placed the vessels (vasaria, Vitruv. l. c.), containing hot and tepid water, which it served to heat; and, on the right, under the floor of the room, which is supported upon a number of low and hollow tubes, is an offset from the hypocausis, which warmed the chamber above it.

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  Hypocausis/1.1