If round the centre of the door which opens as Figure 53, you describe circles on each side of the rebate, and the edges of each door be made circular, it is plain it will also open in this case.
The plan of the doors here shown, are two or three times thicker than those used in practice, in order to show the principle clearly.
Figure 54, a section of the jamb-post, jamb-linings, grounds, and architraves, with part of the plan of a door.
B b. Sections of the grounds, flush, or in the same plane with the plaster.
E e. Outside and inside architraves.
g g g g. Line of the plinth.
c. Jamb-lining.
u. Hanging style.
1. Door style hung to the hanging style u, by means of the hinge m.
Figure 55, half of the plan : showing the door folded back ; the parts in this having the same references as those in Figure 54.
Figure 56, meeting styles.
Figure 57, the moulding of the door, shown to a larger size.
This method is advisable where you have no opportunity of making the doors slide into the partition, as is shown in Figure 32.; but whenever that opportunity offers, it shoiild be preferred, as no door can be seen when shut into the par tition, which not only keeps them entirely out of the way, but makes the most complete appearance.
Elevation of a pair of folding-doors, to be shut quite out of the way, in order to open a communication between two rooms, or to throw both into one on any occasion.
Figure 5S, plan of half the door to a small size.
A. Plan of the outside style.
B, C. Plans of the hanging styles.
D. One of the meeting styles.
a a a, g g g. Framed partitions, distant from each other, in the clear, the thickness of the door.
F F F. The space or cavity for the door to work in, which must be made sufficiently wide to receive one half of the door entirely within, or nearly so: doors of communication for general uses may be constructed in this larger door, in which case the middle doors may be hung to the flaps, on the flanks, so that they will open like any other common folding-door ; this method, therefore, combines utility and convenience, and is a complete deception. The first leaf of the door must run in a groove at the top, to make. it steady.
Figure 59, a section of the style next to the partition. to a large size, with part of the plan of the bottom rail, showing a small part of each partition.
Note. In setting out work of this kind for practice, one half of the plan ought to be completely drawn out.
To find the joint of a jib-door. so that it shall open freely at the honging side, and the joint to be a plane surface.
Figure 60.—Let c, the centre of the hinge, be in the same plane with the dada, and placed within the substance of the lining, in order to give strength to the jamb.
C E. The thickness of the door at the joint, which produce till it cut the opposite side of the base moulding at A; make B equal to A c; join B C, and from B draw B D perpendi cular to B c; then will B D be the true line through which the surbase-moulding must be cut in a plane perpendicular to the floor. The shad awed part shows a part of the jamb-lining cut out sufficient to let the surbase-moulding move in it.
NotP.—If the centre of the hinge had been placed in the plane of the side of the rebate, parallel to the jamb-lining, a deep cavity through the jamb would have been brought into view in the opening of the door, the exposure of which would have been very unsightly.
If the upper part of the door be hinged, the axis of the hinge should be in a straight line with the axis of the centre below, and both the axis of the hinge and the axis of the centre should he in the plane of the face of the door, so that the joint upon the hanging side will always he close.
Figure GI, the elevation of the surbase at the joint.
The construction of a saskti.ame, and the manner of putting the several parts of it together.
Figure 62. the elevation of the sash-frame.
A B C n. The outer edge of it.
The dark perpendicular lines E F, G II, are grooves whose distances from the edges L 11 and x / of the sash-frame, arc equal to the depth of the boxing, together with three-eighths of an inch allowed for the margin between the shutters and the heal.