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 24 First setup Line of sight Horizontal - B Second setup 100 ft 100 ft 100 ft

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 24 First setup Line of sight Horizontal - B Second setup 100 ft 100 ft 100 ft

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Methods of Surveying

Surveying is the practice to determine the relative three-dimensional positions of various points on the earth’s surface. This is done by computing the vertical and horizontal distances, angles between the points, collecting the observations, and plotting them on a map of any appropriate scale. Accuracy can be achieved by using the latest instruments like a theodolite, tachometer, etc. Leveling is a subdivision of surveying where the objective is to locate the elevation of objects considering a datum level.

Question

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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