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Engineering · Civil Engineering
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Review A differential leveling loop began and closed on BM Tree (elevation 1314.08 ft). The backsight sum and foresight sum distances were kept approximately equal. Readings (in feet) listed in the order taken are 3.06 (+S) on BM Tree, 4.76 (−S) and 2.47 (+S) on TP1, 3.05 (−S) and 6.63 (+S) on BM X, 3.64 (−S) and 2.35 (+S) on TP2, and 3.13 (−S) on BM Tree. Prepare, check, and adjust the notes.

Part A

Part complete

What are the backsight and foresight sums?

Express your answers, separated by a comma, to two decimal places.

Backsight sum, Foresight sum 14.51,14.58 ft

f t

, ft

Part B

What is the loop misclosure, and what is the correction for each section, assuming all four sections are the same length?

Express your answers, separated by a comma, to three significant figures.

Misclosure, Correction                                           ft, ft
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