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Figure 8-9.-Difference in elevation. - 14071_161
Figure 8-11.-Horizontal  distances and elevations from stadia readings. - 14071_163

Engineering Aid 2 - Intermediate Structural engineering guide book
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Figure 8-10.-Notes for locating topographical details by transit and stadia. Now let us see how all that you have learned about transit-stadia topography is used in the field Figure 8-10 shows field notes for locating topographic details by transit and stadia. The details shown by numbers in the sketch on the Remarks side are listed on the data side by numbers in the column headed Obj. At the top of the page on the data side, you see that control point D1 was used as the instrument station. Immediately below this, you see that from instrument-station  D1, the transit was backsighted to point A and that all horizontal angles were measured to the right from the backsight on A. In the third line from the top on the data side, you see that the known elevation of  D1 is 532.4  feet  and  that the vertical distance (hi.) from the point or marker at  D1 to the center of the instrument above  D1 is 4.8 feet. This vertical   distance   was   carefully   determined   by measurement  with  a  tape  or  rod  held  next  to  the instrument. Now let us see how each of the objective points was detailed. We will begin with point 1. Remember that in this example,  D1 is the instrument station from which all observations  are  made. To determine the direction of point 1, train the transit telescope on A and match the zeros. Next turn the telescope right to train on point 1 and read the horizontal angle (30010’). 8-10







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