Successive plus and minus sights taken on a downhill line of levels are listed in Problems. The

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Successive plus and minus sights taken on a downhill line of levels are listed in Problems. The values represent the horizontal distances between the instrument and either the plus or minus sights. What error results from curvature and refraction?
20, 225; 50, 195; 40, 135; 30, 250 ft
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