Tufa - Cellular rock; porous limestone.
Turning bridge - A drawbridge that pivots in the middle.
Turret - Small tower, round or polygonal; usually a lookout.
Tufa
a porous, volcanic rock that hardens on exposure to air, used as a building material.
Tumulus (pl. tumuli) ...
Tuf / Tufa
A volcanic stone that was the primary building material used in the construction of Armenian churches.
tufa the calcareous (chalky, containing calcium carbonate) and siliceous (flinty, containing silica) deposits of springs, lakes, or ground water; also a rock composed of compacted volcanic ash: in architectural terms, ...
Despite this, concrete walls were much less costly to construct than walls built of imported Greek marble or even local Italian tufa and travertine.
The Rectangular Temple on the right is Ionic in style (capitals with characteristic volutes) and is built of tufa and travertine with a superficial coating of stucco( bonding material). It stands on a lofty podium in the Republican manner.
The vaults were all built in tufa with horizontal courses in brick and cement. Half of the dome of the Temple of Mercury had fallen down, showing the section to have been nearly that of an equilateral arch.
Tufa is a very light sponge-like limestone formed in aireated springs, and used decoratively eg in grottos or where lightness is important eg at the top of domes. (A cubic metre of sandstone or limestone weighs approx 1.5 tons) ...
Tufa: Cellular rock; porous limestone. Tunnel Vault: See Barrel Vault. Turning Bridge: A drawbridge that pivots in the middle.
 See also: Roman, House, Architecture, Vault, Well
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