LEVELING 



97 



FIG. 38. Leveling rods, a and 6, two views of an 

 architect's rod. c, view of a cheap rod accom- 

 panying the Jackson level. 



126. Leveling rods. With the level there should be 

 a leveling rod. Figure 38 shows two such 



rods ; one (a) is known as the sliding rod. 

 It is catalogued as an architect's rod. It 

 consists of two parts, each in this case 5^ 

 feet long, fitted together and clamped in 

 such a way that the parts may be extended 

 to form a rod 10 feet long. A rod like a 

 is shown extended in b. The other rod 

 c, a simple affair, consists of a single 

 piece f inch by If inches by 8 feet long. 

 These rods are graduated to feet, yV foot 

 and I^-Q foot. Rods are sometimes gradu- 

 ated to feet, inches, and fractions of an 

 inch. Figure 39 shows a standard drain- 

 age engineer's leveling rod. 



Sometimes the face of the rod is spaced 

 or blocked in colors, the spaces or blocks 

 representing fractions of a foot, so that 

 the graduated face can be read at a dis- 

 tance and especially through the telescope 

 of the level. The face of one rod in Fig. 

 38 shows this spacing. 



127. Target. Each of the rods shown 

 in Figs. 38 and 39 is equipped with a 

 target. The target is a circular plate 

 divided into quarters by a horizontal and 

 a perpendicular line, and the quarters 

 painted red and white as shown. The 

 target is constructed to slide up and down 



