Exercise 13 |
Ex.13-1 State and explain the basic principle of levelling. Ex.13-2 Enumerate the difference between rise and fall method (of reduction of level) and height of instrument method. Ex.13-3 Data from a differential leveling have been found in the order of B.S., F.S..... etc. starting with the initial reading on B.M. (elevation 150.485 m) are as follows : 1.205, 1.860, 0.125, 1.915, 0.395, 2.615, 0.880, 1.760, 1.960, 0.920, 2.595, 0.915, 2.255, 0.515, 2.305, 1.170. The final reading closes on B.M.. Put the data in a complete field note form and carry out reduction of level by Height of instrument method. All units are in meters. |