Fig. 1. Plate CCCXXXIII. Fillets.
Fig. 2. Edge rounded. This simple moulding is also sometimes called a bead ; but not unless it is fixed to one side of a rectangular piece of wood, and the rounded part made flush with the other side.
Fig. 3. Flush bead, or bead and quirk.
Fig. 4. Bead and double quirk.
Fig. 5. Double bead.
Fig. 6. Torus. The torus in joinery differs from the beak, in having a fillet.
Fig. 7. Double torus.
Fig. 8. Reeded moulding on the edge.
Fig. 9. Reeded moulding on the face, which may apply to bands, architraves, and pilasters.
Fig. 10. Reeded mouldings round a cylinder or staff. These will apply to columns, or other circular bodies.
Fig. 11. Semicircular flutes, which may apply to bands, pilasters, and columns.
Fig. 12. Shallow flutes, which may also be applied to columns, pilasters, and flat bands.
Fig. 13. Style of a door or shutter, with part of the pa nel, shelving the mouldings which are here termed quirk, ogee, and bead.
Fig. 14. Style and part of the panel of a door or shutter, shewing the mouldings which are in this example termed quirked ovolo and bead.
Fig. 15. Section of a door style, with part of the panel, shewing the mouldings which are here termed bolection mouldings.
Figs. 16, 17, 18, and 19, are various forms of sections for sash bars.
Scribing and When two bodies are so fitted together that their sur faces intersect or meet each other, they are in general said to mitre or scribe.
Two bodies are said to mitre together in a plane pass ing through the common intersection of their surfaces.
One body is said to scribe upon another, when the two surfaces intersect each other, and when so much of the one body is cut off to make way for the other body entire.
In finishing, whether the bodies are mitred or scribed, the external appearance is the same.
As the theory of the intersection of geometrical bodies with one another has been omitted in the article CARPEN TRY, where it is absolutely necessary in the practice of groins and arches, in order to make correct work ; and as it is also essential in joinery, in mitreing, and scribing, we shall make no apology for inserting it in the present article.
The bodies which we shall suppose to be joined together are prisms, cones, and conoids.
Prisms include all solids which may be cut into equal and similar sections by parallel planes, and which may also be cut by parallel planes in some other direction into paral lelograms of the same length ; and consequently, by this definition, not only triangular, rectangular, and polygonal prisms are included, but also cylinders, cylindroids, and such as may have parallel sections, equal and similar para bolas, or equal and similar hyperbolas.
Parabolic and hyperbolic prisms are here supposed to be generated in the following manner. Imagine the plane of the figure to be, with its apex, along a straight line per pendicular thereto, while its axis or double ordinate to the axis may describe a plane.
In order to prevent repetitions, let it be understood, that when two prisms intersect each other, that they intersect at right angles.
The method of ascertaining the construction of the meet ing of the surfaces of two different bodies is, to suppose the position of the one body given in respect to the other, and the position of both in respect to a given plane, and the projection of the intersection of the two surfaces to he made on that plane.
For the purpose of projection, let us suppose that, be sides the plane on which the projection is made, there are two others at right angles, forming, with the plane of pro jection, an internal solid angle.
To render the practice of this easy, we shall suppose that, when the intersection of two prisms is required, the ends are placed at right angles to the plane of projection, and that the double ordinates of their generating figures are parallel thereto.
Let us suppose, in the case of two prisms joining, that the planes generated by the axis of the generating figure of each prism, are the plane whose distances are respec tively x and y.