Question: A level is set up midway between two wood hubs that are about 300 ft. apart. The rod reading on hub A is 9.57 ft.

A level is set up midway between two wood hubs that are about 300 ft. apart. The rod reading on hub A is 9.57 ft. The reading on hub B is 5.51 ft. The level is moved so it is along the side of hub B and about 6 feet away from it. Readings are taken from the new set up with the reading on hub A of 7.59 ft, and on hub B of 3.55 ft.

a. what is the correct difference in elevation between the hubs A and B?

b. If the level had been in perfect adjustment, what reading would have been observed at A from the second setup?

c. what is the line of sight error in 300 ft?

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