TM 9-243TYPES AND USESLevels are tools designed to prove whether a plane orsurface is in the true vertical or true horizontal. All levelsconsist of a liquid-filled glass tube or tubes supported ina frame.MASTER PRECISION LEVELThe master precision level has a ground and graduatedmain vial (1). The top and bottom of the level are milledand ground to make sure both surfaces are absolutelyparallel. This level is used to determine the true hori-zontal with the main vial (1). The true vertical is deter-mined by using the two smaller vials (2).STRIDING LEVELThe striding level is a machinist’s level which is mountedon a raised base. This level is used to span existingcabling, piping, or similar obstructions. It is extremelyuseful in a machine shop for checking the true horizontalof the flatway on a lathe.CARPENTER’S LEVELMACHINIST’S LEVELThe carpenter’s level has three vials which are mountedhorizontally (1) vertically (2) and at a 45 degreeangle (3). The carpenter’s level is used in constructionfor checking for true vertical, true horizontal, and 45degree angles.The machinists level has an extra large vial. Thisincreases its accuracy and sensitivity. Some of theselevels have grooved bottoms which fit over pipes andshafts. They are used in machine shops for levelingwork and equipment.IRON BENCH LEVELThe iron bench level is made of a special design castingwhich insures its lightness, strength, and rigidity. It isused mostly in the construction industry. It may also beused in a machine shop.Some levels have a bent tube (4) which allows thebubble to settle quickly.LINE LEVELThe line level is a single vial in a metal case with a hookon each end for hanging on a cord. It is used to checkwhether two points are level, such as two points on afloor or in an elevation. It must be used with a tightlystretched cord.10-2
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