The best try-squares are now made with blades graduated, and from 2 inches to 12 inches in length. Several sizes of the fixed-blade type, Fig. 54, are needed, as in many cases the blade must be short to admit of its application in pattern work.
The adjustable try-square, illustrated in Fig. 55, is not expensive, and will be found to fill the requirements of several small squares. It is made in two sizes, with graduated blades 4 inches and 6 inches in length, respectively. The blade of this square can be firmly secured in its seat at any point.. When the blade is carried entirely to the front of the handle, it is like an ordinary try-square; and the moving of the blade makes the square equally perfect down to 1/4 inch length of blade, or even less. With one adjustable square of this kind, six inches in length, only one 8-inch or one 10-inch ordinary square will be necessary. A still more convenient, but slightly more expensive, form of adjustable try-square is shown in Fig. 56. It differs from that shown in Fig. 55, in being self-contained, no screwdriver being necessary for moving the blade or securing it in position, and also because the blade can be removed entirely, and an extra blade, shown in Fig. 57, substituted. The ends of this second blade give both the hexagon and octagon angles, which is a matter of great convenience to the pattern maker. Fig. 57 shows the hexagon end of the blade applied, to a hexagon nut. By reversing the blade the octagon end will be in position for use.
Fig. 54. Try-Square with Find Blade.
To the above try-squares there should be added a carpenter's steel square, 24 inches by 18 inches, for use in laying out and squaring up large stock and large patterns.