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The following consecutive readings were taken with a dumpy level 6.21, 4.92, 6.12, 8.42, 9.81, 6.63, 7.91, 8.26, 9.71, 10.21 The level was shifted after 4th, 6th and 9th readings. The reduced level at first point was 100 ft. Rule out a page of your answer-book as a level field book and fill all the columns. Use collimation system and apply the usual arithmetical check.?
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The following consecutive readings were taken with a dumpy level 6.21,...
Level Field Book

Collimation System

Arithmetical Check

Reduced Level Calculation

First Point RL = 100 ft

Reading No. | Backsight (BS) | Foresight (FS) | Intermediate Sight (IS) | Reduced Level (RL) | Remarks
--- | --- | --- | --- | --- | ---
1 | - | 6.21 | - | 100.00 + 6.21 = 106.21 | Initial point
2 | 6.21 | 4.92 | - | 106.21 - 4.92 = 101.29 | -
3 | 4.92 | 6.12 | - | 101.29 + 6.12 = 107.41 | -
4 | 6.12 | 8.42 | - | 107.41 - 8.42 = 98.99 | Shifted
5 | - | 9.81 | - | 98.99 + 9.81 = 108.80 | -
6 | 9.81 | 6.63 | - | 108.80 - 6.63 = 102.17 | Shifted
7 | - | 7.91 | - | 102.17 + 7.91 = 110.08 | -
8 | 7.91 | 8.26 | - | 110.08 - 8.26 = 101.82 | -
9 | 8.26 | 9.71 | - | 101.82 - 9.71 = 92.11 | Shifted
10 | - | 10.21 | - | 92.11 + 10.21 = 102.32 | Final point

Collimation Error Calculation

Backsight (BS) | Foresight (FS) | Collimation Error (CE)
--- | --- | ---
6.21 | 4.92 | 0.00 (initial)
4.92 | 6.12 | -0.01
6.12 | 8.42 | -0.01
9.81 | 6.63 | 0.02
7.91 | 8.26 | 0.02
8.26 | 9.71 | 0.02
Total | | 0.03

Arithmetical Check

Sum of BS = 42.23

Sum of FS = 55.46

Sum of RL = 922.90

Closing Error = Sum of BS - Sum of FS = 42.23 - 55.46 = -13.23

Correction = Closing Error / Number of Sights = -13.23 / 9 = -1.47

Adjusted RL = RL + Correction

Adjusted RL at final point = 102.32 - 1.47 = 100.85

Reduced Level Calculation (Adjusted)

First Point RL = 100.85 ft

Reading No. | Backsight (BS) | Foresight (FS) | Intermediate Sight (IS) | Reduced Level (RL) | Remarks
--- | --- | --- | --- | --- | ---
1 | - | 6.21 | - | 100.85 + 6.21 = 107.06 | Initial point
2 | 6.21 | 4
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The following consecutive readings were taken with a dumpy level 6.21, 4.92, 6.12, 8.42, 9.81, 6.63, 7.91, 8.26, 9.71, 10.21 The level was shifted after 4th, 6th and 9th readings. The reduced level at first point was 100 ft. Rule out a page of your answer-book as a level field book and fill all the columns. Use collimation system and apply the usual arithmetical check.?
Question Description
The following consecutive readings were taken with a dumpy level 6.21, 4.92, 6.12, 8.42, 9.81, 6.63, 7.91, 8.26, 9.71, 10.21 The level was shifted after 4th, 6th and 9th readings. The reduced level at first point was 100 ft. Rule out a page of your answer-book as a level field book and fill all the columns. Use collimation system and apply the usual arithmetical check.? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The following consecutive readings were taken with a dumpy level 6.21, 4.92, 6.12, 8.42, 9.81, 6.63, 7.91, 8.26, 9.71, 10.21 The level was shifted after 4th, 6th and 9th readings. The reduced level at first point was 100 ft. Rule out a page of your answer-book as a level field book and fill all the columns. Use collimation system and apply the usual arithmetical check.? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The following consecutive readings were taken with a dumpy level 6.21, 4.92, 6.12, 8.42, 9.81, 6.63, 7.91, 8.26, 9.71, 10.21 The level was shifted after 4th, 6th and 9th readings. The reduced level at first point was 100 ft. Rule out a page of your answer-book as a level field book and fill all the columns. Use collimation system and apply the usual arithmetical check.?.
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