and a 16″ (406 mm) tongue that form a 90° angle (right angle). A bench square is smaller. See Figure 12-11. The face of the square is seen when the body is held in the left hand and the tongue in the right hand. The back is the other side of the square. The face and back of both squares have measurement scales and most framing squares also have tables. Try Square Try squares have a steel blade and a steel or wood handle. Some have a 45° angle cut into the handle. Try squares are the most reliable of all squares for accu- racy. Use them for making layouts, checking square- ness, or setting up machinery. See Figure 12-12. Combination Square A combination square is more versatile than a try square. It consists of a grooved blade that slides through the handle. It can also be equipped with a protractor and a center head. See Figure 12-13. You can use a combination square for a number of purposes: • Measure distances and depths. • Lay out 45° and 90° angles. • Draw parallel lines. • Locate centers. To lay out a parallel line, adjust the blade to the intended distance. Place a marking device such as a pencil, scratch awl (from the handle on some squares), or knife point against the end of the blade. While holding the marking device against the blade, slide the square down the material. See Figure 12-14A. Patrick A. Molzahn Figure 12-10. Four ways calipers can be used to take measurements. Steps Measurements External Measurements Internal Measurements Depth Measurements Stanley Tools Figure 12-11. Framing squares are larger than bench squares. The framing square may also have a list of scales and tables printed on it. Tongue Body Framing Square Bench Square Chapter 12 Measuring, Marking, and Laying Out Materials 153 Copyright Goodheart-Willcox Co., Inc.