CLINOMETERS

CLINOMETERS Clinometers are used for measuring inclinations in the horizontal plane. They are used in naval shipyards principally to measure inclinations in equipment foun- dations and equipment roller-path inclinations (RPIs). All clinometers use a spirit level for indicating the true horizon and have some means of measuring incli- nations of the base with respect to the horizon (spirit level). Figure 3-9 shows the type of clinometer com- monly used for making accurate RPI measurements. The micrometer drum 90° clinometer is read directly to 1 inch and can be interpolated to within 15 inches on the drum. The 6-inch-base length makes this type of clinometer suitable for many uses. An adjustable base permits reading angles from zero, even when working surfaces are not perfectly horizontal. LEVELS Figure 3-9.—Typical clinometer. ALIGNMENT SIGHTS The two types of levels are (1) those that indicate Alignment sights are used to establish the pointing entirely by means of graduations on the level vial, and line of equipment. The pointing line maybe the bore (2) those adjustable types that are hinged at one end axis of a gun, the centerline of a torpedo tube, the and have calibrated micrometer adjustments at the propagation axis of a radar beam, or some other sim- other end to extend the range beyond that on the level ilar line. Accurate alignment is not possible unless the vial alone. pointing line is accurately determined. Some align- 3-7