Types and Uses - Continued

TM 9-243 TYPES AND USES - Continued The following scales or inch divisions are found on the carpenter’s square: Face of body outside edge inches and sixteenths Face of body inside edge inches and eighths Face of tongue outside edge inches and sixteenths Face of tongue inside edge inches and eighths Back of body outside edge inches and twelfths Back of body inside edge inches and sixteenths Back of tongue outside edge inches and twelfths Back of tongue inside edge inches and tenths TRY SQUARE The try square is made of a steel or wood stock (1) and a blade (2). The blade is from 2 to 12 inches long and is graduated in eighths. The try square is used to set or check lines which are at right angles (90 degrees) to each other. COMBINATION SQUARE The combination square is made up of the following components: 1. A slotted 12-inch stainless steel rule (1) which is graduated in eighths, sixteenths, thirty-seconds, and sixty-fourths of an inch. It can be used as a measuring scale by itself or with any one of the following components. 2. The center head (2) when attached to the rule, bisects a 90 degree angle. It’s used for determining the center of cylindrical work. 3. The protractor (3) has a level (4) and a revolving turret (5) which is graduated in degrees from 0 to 180 or 0 to 90 in either direction. It is used to lay out and measure angles to within one degree. 4. The square head (6) has a level (7), a scribe (8), and 45 degree (9) and 90 degree sides (10). It is used to lay out 45 and 90 degree angles and to check level. It may also be used as a height or depth gage. 13-3