How far from vertical must the top of an 8-ft level rod have to be to
create an error of 0.005 ft with a reading at 5.00 ft?
Similar to except for a 1.0-mm error with a reading at
1.200 m on a 4-m rod.
A line of three-wire differential levels goes from bench mark Rock
to bench mark Train. The length of the line was determined to
be 2400 m. The instrument had a stated compensator accuracy of
±0.2′′. The instrument-rod combination had an estimated reading
error of ±1.5 mm per km. The instrument is found have an inclined
collimation error of 2.0 mm per km, so the sight distances were kept
to approximately 30 ± 3 m. If the observed difference in elevation is
−65.906 m, what is the estimated error in the final elevation difference?