Collier's New Encyclopedia (1921)/Door

DOOR, a wooden or metal, or partly wood and partly metal frame, constructed so as to open and shut on hinges and close the entrance to a building, rooms, etc. The doors of ancient Egypt and contemporary nations swung upon vertical pintles which projected from the top and bottom of the door into sockets in the lintel and threshold respectively. The commonest form of door had the pintle in the middle of the width; so that, as it opened, a way was afforded on each side of it for ingress or egress. Double-margin doors are made in imitation of folding-doors, the middle style being made double with an intervening bead. Sliding-doors are an improvement on folding; they slip into grooves in the partition. A proper-ledged door is one made of boards placed side by side with battens called ledges at the back. With a diagonal piece at the back, in addition, it is said to be framed and ledged.