Joints Used In The Construction Of Partitions. In fig. 333 we illustrate the various forms of joints used for this purpose; a, b, and c illustrate one method of joining the foot of " post" a, with the cill b; c a plan of same showing the "mortice" d, into which the "tenon" e, is passed; f, g, and h illustrate another method in which a " double tenon " is used, f being elevation of post, g " cill," h part plan. In i and j the elevation and section of a third method is shown, this being what is called a "foxtail" tenon and mortice; k the mortice made with " dovetail" sides; I the tenon, in the under side of which the two smaller wedges m are driven. When the post is driven home, these wedges m force out the sides of the tenon I, and make it fill up the space of the mortice k. In n, o shows a mortice of another form, the tenon at foot of post being made to fit into this. Tenons are sometimes made in the form of a cross, the arms of which are at right angles to each other; at p, q, and r, we illustrate a method of joining the foot of a brace or strut s to the cill t, by a tenon w partly cut at the foot of s, which goes into the mortice v, plan in r; w and x show methods of joining the fitting-in pieces or studs in the brace or strut s, the feet and heads of the fitting-in pieces being jointed to the "cill" and the "head" of the partition by the method shown in a, b, and c, fig. 333, at e and d ; y and z, same figure, illustrate a method of joining the head a of a door opening to the posts, by the sloping shoulder; a tenon a" may be cut on this and let into a mortice - shown by the dark part in b' - cut in the face of the post; c and d, fig. 333, show other methods of joining the heads of door openings to the posts.