1. Set up the level so that the sighting distances to A and B are about the same. 2. Set up the staff at A and read off the backsight R = 1.305. 3. Set up the staff at B and read off the foresight V = 2.520. The difference h from the required height at B is calculated as: h = V – R - ∆H = 2.520 – 1.305 – 1.00 = +0.215m 4. Drive in a post at B and mark the required height (0.215m above ground level). In another frequently-used method, the required staff reading is calculated in advance: V= R - ∆H = 1.305 - (-1.000) = 2.305 The levelling staff is then moved upwards or down- wards until the required value can be read off with the level.
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