LAYING OUT A DRAIN OR SYSTEM 



119 



163. Leveling with cheaper 

 levels. Figure 47 shows a cheaper 

 form of level described in para- 

 graph 125, in three positions, that si 

 is, first, between stakes 1 and 2, 

 second, between stakes 2 and 3, 

 and third, between stakes 3 and 

 4. It shows, also, the leveling 

 rod in positions successively at 

 which it would be held to ob- 

 tain the three back-sight and the 

 three fore-sight readings spoken 

 of in paragraphs 134 and 136. 

 There are shown, also, the direc- 

 tions in which the three back- 

 sight and the three fore-sight 

 readings were taken, with their 

 values. These readings will be 

 found in columns 3 and 5 in the 

 table on the following page. 



There will be found in columns 3 

 and 5, also, the readings taken for 

 determining the elevations of the 

 remaining stakes. In column 1 of 

 the table are the numbers of the 

 stakes 1 to 11, in column 2 is shown 

 the distance of each stake from 

 stake 1. In this case the stakes 

 are located 50 feet apart, so that 

 stake 2 is 50 feet from stake 1, 

 and stake 3 is 100 feet from stake 

 1, and so on up to stake 11, 

 which is 500 feet from stake 1. 



