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Figure 8-10.-Notes for locating topographical details by transit and stadia. - 14070_160
TOPOGRAPHIC    MAPPING - 14070_162

Engineering Aid 1 - Advanced Structural engineering guide book
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Figure 8-11.-Horizontal  distances and elevations from stadia readings. For the horizontal distance and elevation of point 1, set a rod on the point, and train the lower stadia hair of the transit telescope on a whole-foot mark on the rod so that the center hair is near the 4.8 graduation. (This is a common practice in stadia work that makes reading the stadia  interval  easier.)  Then  read  and  record  the  stadia interval (in this case 6.23 feet). Next, rotate the telescope about the horizontal axis until the center hair is on the 4.8  rod  graduation.  Lock  the  vertical  motion  and  read and record the vertical angle (-3026’). Be sure to record each vertical angle correctly as plus or minus. While you are reading and recording the vertical angle, the rodman can be moving to the next point. This will help speed up the survey. From the stadia interval and the vertical angle reading, the horizontal distance (entered in the fifth column of fig. 8-10) and the difference in elevation (in the sixth column) are determined from a stadia reduction table.  Figure  8-11  shows  the  page  from  a  stadia reduction table that applies to the data for point 1 in figure 8-10. For this point, the vertical angle is  –3026’, 8-11







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