A line of levels with 42 setups (84 rod readings) was run from BM Rock to BM Pond with readings taken to the nearest 3.0 mm; hence any observed value could have an error of 1.5 mm For reading errors...

A line of levels with 42 setups (84 rod readings) was run from BM Rock to BM Pond with readings taken to the nearest 3.0 mm; hence any observed value could have an error of
1.5 mm For reading errors only, what total error would be expected in the elevation of BM Pond?

Compute the permissible misclosure for the following lines of levels: (a) a 10-km loop of third-order levels (b) a 20-km section of second-order class I levels (c) a 40-km loop of first-order class I levels.