Fig. 356.—Rafter and Tie Beam Joint.
Rafter Joint.—[Fig. 356] shows an everyday joint, as used at the juncture of the principal rafter and the tie-beam in roof truss work. A sketch of piece A is shown separated, and it should be noted that the depth of the cut portion B should not be more than one-fourth of the total width of the tie-beam.
Fig. 357.—Method of Pelleting the Corner of a Mitred Picture Frame.
Pelleting.—[Fig. 357] indicates the method of pelleting and screwing the corner of a picture frame. The mitre joint is first screwed and a pellet of the same timber is made to fill the hole which has been bored to receive the screw head. The pellet is glued in position and levelled off.
Fig. 358.—Patera Covers to Hide Screws.
Patera Covers.—In cases where the style of ornament permits of it, patera covers are used instead of pelleting. [Fig. 358] shows the jointing of shaped spandrails, etc., to carcase ends of light portable cabinet work, etc. A hole is bored about 3⁄8 in. deep into the end, and a screw is used to hold the shaping in position. After fixing the rail a small turned button, called a turned patera, is inserted in the hole, thus giving an ornamental finish, as shown in the front view. The turned patera is driven fairly tightly into the hole, but not glued. When it is required to take the article apart a chisel is carefully inserted under the edge of the patera to remove it, and the screw can then be taken out. This method is often used for the construction of light hanging bookcases and similar objects. For a bookcase having an end 8 ins. wide three of these turned buttons and three screws would be used to secure the shelf to the end. Pateras in different styles may be purchased from any dealer in woodworking sundries.