work. Each joint used in the construction of this frame may be dealt with separately. The numbers marked on Fig. 28 refer to the individual joints, shown separately in Figs. 29 to 38.
[Illustration: Fig. 29.--Halved Corner Joint.]
[Illustration: Fig. 30.--Halved T Joint.]
Fig. 29 shows the "Halved Joint" at the corner of the frame where the two pieces form a right angle (see Fig. 28, 1). Each piece is halved and shouldered at opposite sides, thus forming a perfect fit one with the other and giving a strong joint with a minimum amount of labour. For inside work the joint would be glued and screwed together, the screw heads being countersunk so as not to come in contact with the cutting iron of the plane when levelling off the work. For outside work, in exposed positions where the work will have to withstand the weather, the alternative method of smearing the joint with paint or with a mixture of varnish and white lead would be advisable, the joint being nailed or screwed. Fig. 29 shows the