Figure, 21.—A four equal-panelled door; this form is only used in Common work, and frequently without mouldings.
Figure 25.—A nine-panelled door, with square panels at the top.
Figure 26.—A six equal-panel pair of folding doors, two panels in breadth and three in height.
Figure 27.---A double margin or folding-door, with three panels in height, and two in bre:chit; being all equal.
Figure 28.—A double margin, or pair of folding-doors, with annr panels in height and two in breadth, and with two lying panels below the top rail, and two above the lock rail.
Figure 29.—A ten-panelled pair of fidding-doors, five in height a»d two in breadth, with two Is ing under the top rail, two above the bottom rail, and two in the middle: of this form is the ancient door of the Pantheon at Rome.
Figure 30.—An ancient door. narrower at the top than at the bottom : of this firm is the door of the temple of Vesta, at Ilione. and that of Erechthens. at Athens. This construc tion may be useful ilia causing the door to rise as it opens, in order to clear a carpet, or to make it shm of itself; Figures 31 and 32.—Moons of coin immication, or such as shut omit of the way of the flair. Figure 31, folds round upon the partition, by means of hanging styles: Figure 32, is made to shut occasionally in the partition, so as to lie entirely concealed. The two middle parts open, like ordinary folding doors, upon hinges thstened to the extreme parts.
Figure 33.—A jib-door, which when shot may be as much concealed as possible. .111i-doors are used to preserve the uniformity of a room, or to save the expense of a eloTespond. Mg door.
Doors ought to be made of clean good stuff,.firmly put together, the mitres or scribings brought together with the greatest exactness, and the whole of their surfaces perfectly smooth, particularly those made for the best apartments of good houses; in order to effect this, the whole of the work ought to be set out and tried up with particular care ; saws and all other tools must be in good order ; the mortising, tenoning, ploughing, and sticking of the mouldings, ought to be correctly to the gauge lines; these being strictly attended the work will of necessity, when pa together, close with certainty ; but it otherwise, the workman must expect a great deal of trouble in paring the different parts before the work can be made to appear in any degree passable : this will also occasion a want of firmness in the work, particularly if the tenons and mortises are obliged to be pared.
In bead-and-flush doors, the best way is to mitre the work square, afterwards put in the panels, and smooth the whole off together, then marking the panels at the parts of the framing they agree to, take the door to pieces, and work the beads on the styles, rails, and mountings.
If the doors are double-margin, that is, representing a pair of folding-doors, the stall' stile, which imitates the meeting stiles, must be entered to the top and bottom rails of the door, by forking the ends into notches cut in the top and bottom rails.
Of hanging doors.—Ilaring treated fully on the various kinds of hinges under the article 1UxOtvy, we shall here make a few observations upon, and give sonic rules for, hanging of doors, so as to clear the ground or carpet.
First, IZaise the floor under the door as much as may be necessary, according to the thickness of the carpet, &c.
Secondly, Make the knuckle of the bottom hinge to project beyond the perpendicular of the top hinge about one-eighth of an inch: this will throw the door off the floor.
Xde.—The centre of the top hinge must project a little beyond the surface of the door, if the hinge is let equally into the door and into the jamb ; otherwise, if the centre lie in the surface of the door, it ought to be placed at the very top, which is seldom done, except when hung with centres.
Thirdly, Fix the jamb, on which the door hangs, out of the plumb line, so that the top of the jamb may incline to the opposite jamb about one-eighth part of an inch : this will contribute to the effect of clearing the door from the floor.