An inexperienced engineer has carried out a level using a booking sheet. The engineer started at an Ordnance Survey Benchmark 'X' and wrote the levels down in the order that they took them as shown in Table Q1.1 below. Survey point OSBM-X P1 P1 P2 P2 GL1 GL2 GL3 P3 P3 P4 P4 OSBM-X Table Q1.1 Observation type BS FS SSSSSSSSSSSSS BE BS FS BS IS IS IS FS FBFBF BS FS BS FS Measured reading 3.445 2.706 0.331 1.260 2.985 2.110 2.854 0.833 4.121 0.422 0.310 2.395 1.191 a) Given that the Reduced Level of OSBM-X is 101.931 above sea level, find the reduced levels of the other survey points using the Height of Collimation method. Carry out all checks and make comments as appropriate. A booking sheet has been provided for your use as shown in Table Q1.2 (overleaf). b) Briefly explain the procedure for setting up an automatic level. [18 marks]