20 AR CITITECTUR E. 



|)lcto a frontispiece, and which finishes the fronts of build- 



iiif^s, or is phiccd as an ornament over gates, doors, windows, 



or niclies. 

 Pent-Roof. — A roof of any building or slied formed like an 



iiK liiiod plane, the slope being all on one side. 

 Per'istyle. — A range of columns around a building or square ; or 



a Ituilding encompassed by a row of columns on the outside. 

 Pilas'ter. — A sort of square column, sometimes insulated, but 



more commonly engaged in a wall, and projecting only a 



fourth or fifth of its thickness. 

 Pinnacle. — A slender turret or part of a building elevated 



above the main building. 

 Plate. — A piece of timber lying horizontally on a wall, to 



receive the ends of girders, rafters, etc. 

 Plinth. — The square, flat table under the moulding of the base 



of a column. 

 Pol'ystyle. — A building surrounded by numerous columns, so 



that they cannot be readily counted at first view. 

 Porch. — An exterior appendage to a building, forming a covered 



approach to one of its principal doorways. 

 Portico, or Piazza. — A covered space enclosed by columns at 



the entrance of a building. 

 Pro'style. — A portico in which the columns stand in advance 



of the building to which they belong. 

 Purlin. — A piece of timber extending from end to end of a 



building or roof, across and under the principal rafters, to 



support them in the middle. 

 Raft'er. — A piece of timber that extends from the plate of a 



building toward the ridge, and serves to support the 



covering of the roof. 

 Rere'dos. — The screen or wall behind an altar in a church ; 



also, the back of a fireplace. 

 Rood-Tower. — A tower or steeple at the intersection of the 



navo and transept of a church. 

 Rose-Window. — A circular window, with compartments of 



mullions and tracery branching from a centre, sometimes 



called a Catherine-wheel or marigold-window. 

 Rotun'da. — A round building; any erection that is round both 



on the out.-^ide and inside. 

 Rus'tic-Work. — A term used when the stones, etc., in the face 



of a building or the groins, etc., are hacked or indented, 



so as to be rou<ih. 



