When carrying out the permanent adjustments of a dumpy level by two-peg method, the following observation were made. Instrument at E midway between C and D, 100 m apart. Reading at point C = 2.000 m Reading at point D = 3.000 m Instrument at F in line of CD such that CF = 120 m and DF = 20 m. Reading at point C = 1.500 m Reading at point D = 2.750 m Check whether the instrument needs permanent adjustments or not, and whether the line of sight is inclined upwards. What should be the correct reading at C if the instrument is to be adjusted?

Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter15: Slope Stability
Section: Chapter Questions
Problem 15.28P
Question
When carrying out the permanent adjustments of a dumpy level by two-peg method, the
following observation were made.
Instrument at E midway between C and D, 100 m apart.
Reading at point C = 2.000 m
Reading at point D = 3.000 m
Instrument at F in line of CD such that CF = 120 m and DF = 20 m.
Reading at point C = 1.500 m
Reading at point D = 2.750 m
Check whether the instrument needs permanent adjustments or not, and whether the line of sight
is inclined upwards. What should be the correct reading at C if the instrument is to be adjusted?
Transcribed Image Text:When carrying out the permanent adjustments of a dumpy level by two-peg method, the following observation were made. Instrument at E midway between C and D, 100 m apart. Reading at point C = 2.000 m Reading at point D = 3.000 m Instrument at F in line of CD such that CF = 120 m and DF = 20 m. Reading at point C = 1.500 m Reading at point D = 2.750 m Check whether the instrument needs permanent adjustments or not, and whether the line of sight is inclined upwards. What should be the correct reading at C if the instrument is to be adjusted?
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