Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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7. A horizontal collimation test is performed on an automatic level. With the instrument setup
at point 1, the rod reading at A was 5.630 ft, and to B was 5.900 ft. After moving and leveling
the instrument at point 2, the rod reading to A was determined to be 5.310 ft and to B 5.560 ft.
As shown in the following figure, the distance between the points was 100 ft. What is the
collimation error of the instrument, and the corrected reading to A from point 2?
Rg
Line of sight
Horizontal
26
2
First setup
RA
Line of sight
Horizontal
A
1
Second setup
100 ft
100 ft
100 ft
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Transcribed Image Text:7. A horizontal collimation test is performed on an automatic level. With the instrument setup at point 1, the rod reading at A was 5.630 ft, and to B was 5.900 ft. After moving and leveling the instrument at point 2, the rod reading to A was determined to be 5.310 ft and to B 5.560 ft. As shown in the following figure, the distance between the points was 100 ft. What is the collimation error of the instrument, and the corrected reading to A from point 2? Rg Line of sight Horizontal 26 2 First setup RA Line of sight Horizontal A 1 Second setup 100 ft 100 ft 100 ft
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