Practical carpentry, joinery, and cabinet-making [by P. Nicholson by Peter Nicholson

Author:Peter Nicholson
Language: eng
Format: epub, pdf
Published: 1826-03-25T05:00:00+00:00

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de\ describe the circle bci ; make df equal to the radius of the circle bci, and join a/. Bisect af by a perpendicular, gh, meeting a fin /i; then, with the radius dg, describe the aicdb: db c will then be the ovolo required.

92. Figure 17 is the section of a concave moulding called a Scotia. To form this moulding, describe the circle dabf and draw cd perpendicular to the fillet. Make eg equal to the radius of the circle to be described, and let e be the centre of that circle: join ge, and bisect ge hy the perpendicular df: from d, with the radius dc, describe the arc c6, and eba will be the acotia required.

23. Figure 18 represents the section of a piece of wood when it is said to be rebated. Figure 19, the section of a piece of wood said to be grooved. Figure 20, the sections of two pieces grooved and tongued together: where No. 1 shows the tongue, and No. 2 the groove, and these are so adapted to each other that they may be joined closely together. This method is used where it is required to join many boards together, so as to have the effect of one board, and prevent wind or air from coming through the joints between every two boards, without the risk of splitting, which would take place if the boards were glued together.

Figure 21 represents the section of a piece of wood said to be rebated and beaded.

FRAMING ANGLES.

24. When the length of a joint at an angle is not considerable, it is sufficient to cut the joint, so that when the parts are joined, the plane of the joint shall bisect the angle. This kind of joint is called a plain mitre, and is shown for different angles by fg. 1, plate XLIF,

25. Wiien an angle of considerable length is to be joined, and the kind of work does not require that the joining should be concealed, fg. 2 is often employed; the small bead renders the appearance of the joint less objectionable, because any irregularities, from shrinkage, are not seen in the shade of the quirk of the bead.

A bead upon an angle, where the nature of the thing does not determine it to be an arris, is attended with many advantages; it is less liable to be injured, and admits of a secure joint, without the appearance of one. Fig. 3 shows a joint of this description. It is the method usually adopted for joining linings together at external angles.

26. Figure 4 represents a very good joint for an exterior angle, whether it be a long joint or a short one. It is employed for mitring dado together at external angles. The joint represented by Jig. 5 is esteemed superior to it for long joints in the direction of the grain of the pieces, the parts being drawn together by the form of the joint itself, they can be fitted with more accuracy, and joined with more certainty.

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