conspicuous.

TERMINAL (or Finial).--The ornamental top of a pinnacle,
gable, &c.

TERRA-COTTA.--A fine kind of brick capable of being highly
ornamented, and formed into blocks of some size.

THRUST.--The pressure exercised laterally by an arch or
vault, or by the timbers of a roof on the abutments or
supports.

TIE.--A beam of wood, bar of iron, or similar expedient
employed to hold together the feet or sides of an arch,
vault, or roof, and so counteract the thrust.

TORUS.--A large convex moulding.

TOWER.--A portion of a building rising conspicuously above
the general mass, and obviously distinguished by its height
from that mass. A detached building of which the height is
great, relative to the width and breadth.

TRACERY (Gothic).--The ornamental stonework formed by the
curving and interlacing of bars of stone, and occupying the
heads of windows, panels, and other situations where
decoration and lightness have to be combined. The simplest
and earliest tracery might be described as a combination of
openings pierced through the stone head of an arch. Cusping
and foliation (which see) are features of tracery. (See
Figs. 18, 19, 55, and 57 in the text.)

[Illustration: FIG. _E E_.--PERPENDICULAR WINDOW-HEAD.]

[Illustration: FIG. _F F_.--LATE PERPENDICULAR WINDOW-HEAD.]

TRANSEPT.--The arms of a church or cathedral which cross
the line of the nave.

TRANSITION.--The architecture of a period coming between and
sharing the characteristics of two distinctly marked styles
or phases of architecture, one of which succeeded the other.

TRANSOM.--A horizontal bar (usually of stone) across a
window or panel.

TREFOIL.--A three-leaved or three-lobed form found
constantly in the heads of windows and in other situations
where tracery is employed.

TRIFORIUM (or THOROUGH-FARE).--The story in a large church
or cathedral intermediate between the arcade separating the
nave and aisles, and the clerestory.

TUDOR.--The architecture of England during the reigns of the
Tudor kings. The use of the term is usually, however,
restricted to a period which closes with the end of Henry
VIII.'s reign, 1547.

TURRET.--A small tower, sometimes rising from the ground,
but often carried on corbels and commencing near the upper
part of the buildin