Fig. 1 shows a side elevation of a carpenter's bevel set-square of suitable dimensions for setting out diminished stile doors constructed of plank widths; but a much smaller tool would be more handy for general purposes. The tool con-sists of two parts -. a skeleton set-square made of steel or stout zinc, the former preferably, and an adjustable stock working iu a slot which is about two-thirds the length of the long edge of the square. The stock is very similar to that of an ordinary bevel, except that it is in two parts which are connected at the ends by means of clamping set-screws, as shown in the end elevation (Fig. 2); the tool can thus be adjusted to almost any position. Fig. 3 is a part elevation of a diminished stile door, shown in order to explain the application of the tool in setting-out the shoulders of the joint. This is shown in detail at Fig. 4.. The dotted lines on the part A are the setting-out lines for the rail, and those on the part B are the setting-out lines for the stile. Figs. 3 and 1 should be compared. The rail and stile are shown separated in the sketch for the purpose of illustrating the method of using the square. Fig. 5 shows another joint where the tool can be applied with advantage. Fig. 6 shows the tool being used as a pitch-board; it can be worked from either edge of the string, and although it does not do away with the wooden pitch-board itself, no sliding slip is required, while its thinness and metal edges enable a much cleaner job to be made with the striking-knife. Fig. 7 shows the tool applied to roofing. A number of ratters can be laid side by side, and the length squared across them with a line at both ends. The stock of the square is then set to the pitch of the roof, and both bevels are obtained at once; no awkward moulds require to be lilted up and down, and both the bevels and the square are comprised in the same instrument. Fig 8 shows a mitred joint of two different thicknesses of wood; the thick lines show the edges of the square when it is applied. The tool can easily be changed into a perfectly true mitre square by fixing the stock at equal distances along both edges from the angle, or it can be used as an ordinary bevel. A wooden instrument based on the same principles is used by some joiners, but it is a clumsy article, and cannot be finely adjusted. The tool can be used as a set-square, or, by clamping down the stock in the position shown by dotted lines in Fig. 1, as a try-square.

How To Make a Bevel Set-square.