2.13, A digital level was checked

for collimation error using a two-peg test and the following results were obtained. With the level midway between two pegs B1 and B2 which are 40 m apart: Staff reading at B1 = 1.476 m Staff reading at B2 = 1.432 m Level set up 10 m from B2 along the line B1–B2 extended: Staff reading at B1 = 1.556 m Staff reading at B2 = 1.472 m Calculate the collimation error in the level and the readings that would have been obtained with the level in the second position close to B2 had it has been in perfect adjustment.

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