1. TWO-PEG TEST. In the two-peg test of dumpy level, the following observations are taken: ROD READING INSTRUMENT SET UP NEAR M INSTRUMENT SET UP NEAR P 1.563 m On Point A On Point B i0.296 m 0.910 2.140 Point M is equidistant from both A and B, while P is 2,50 m away from A along the extension of line AB and 79. 27 m from B. Requirements: a. Determine the true difference in elevation between points A & B. b. Check if the line of sight is in adjustment.
1. TWO-PEG TEST. In the two-peg test of dumpy level, the following observations are taken: ROD READING INSTRUMENT SET UP NEAR M INSTRUMENT SET UP NEAR P 1.563 m On Point A On Point B i0.296 m 0.910 2.140 Point M is equidistant from both A and B, while P is 2,50 m away from A along the extension of line AB and 79. 27 m from B. Requirements: a. Determine the true difference in elevation between points A & B. b. Check if the line of sight is in adjustment.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question

Transcribed Image Text:1. TWO-PEG TEST. In the two-peg test of dumpy level, the following
observations are taken:
ROD READING INSTRUMENT SET UP
INSTRUMENT SET UP
NEAR P
NEAR M
On Point A
On Point B
i0.296 m
1.563 m
0.910
2. 140
Point M is equidistant from both A and B, while P is 2,50 m away from A
along the extension of line AB and 79. 27 m from B.
Requirements:
a. Determine the true difference in elevation between points A & B.
b. Check if the line of sight is in adjustment.
14
c. If the instrument needs to be adjusted, determine the following:
"false" difference in elevation, inclination of the line of sight, and the
error
on the reading on the far rod.
d. With the level still set up at P, determine the rod reading on B to which
the
line of sight should be adjusted.
e. Perform the customary check.
Fig. 16-3. Tw0-peg test.
-Leveling
Rod
Loveling.
Rod
c=1.563 m
d 2.140
b=0.910m
a=0296m
Ground
Surface
La
(2.50 m)
(76.77 m)
(79.27 m)
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