From Manners and Customs of the Bible:

Ach, “hearth,” is a portable furnace or stove. The rooms of Oriental houses are sometimes warmed at the present day by means of such pots or furnaces. “They have the form of a large pitcher, and are placed in a cavity sunk in the middle of the apartment. When the fire has burnt down, a frame like a table is placed over the pot, and the whole is then covered with a carpet; and those who wish to warm themselves sit upon the floor and thrust their feet and legs, and even the lower part of their bodies, under the carpet” (Robinson's Gesenius).

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