C. Leveling Rod BS Elev. of TP, Difference in Elev. between Elev of BM and BM₂ BM, (known) (Do not copy the illustration or drawing) Table: Determination of Elevation STATION BS HI FS ELEVATION BM1 1.60 m 100 m TP1 1.47m 0.85 TP2 1.67 m 0.78 TP3 1.54 m 0.89 BM2 0.75 COMPUTATIONS: 1. Computing Height of Instrument and Elevation. In differential leveling, the following two (2) equations are repeatedly used a.) HI = Elev + BS b.) Elev = HI - FS Where: HI= height of instrument above a reference datum (MSL) BS = backsight reading on the rod (or plus sights) FS = foresight reading on the rod (or minus sights) ELEV = elevation above datum of a point sighted BS Leveling Rod L₁ FSI HI, BM, STOMATO Leveling Rod Horizontal Line of Sight FS BM Elev. of BM₂

C. Leveling Rod BS Elev. of TP, Difference in Elev. between Elev of BM and BM₂ BM, (known) (Do not copy the illustration or drawing) Table: Determination of Elevation STATION BS HI FS ELEVATION BM1 1.60 m 100 m TP1 1.47m 0.85 TP2 1.67 m 0.78 TP3 1.54 m 0.89 BM2 0.75 COMPUTATIONS: 1. Computing Height of Instrument and Elevation. In differential leveling, the following two (2) equations are repeatedly used a.) HI = Elev + BS b.) Elev = HI - FS Where: HI= height of instrument above a reference datum (MSL) BS = backsight reading on the rod (or plus sights) FS = foresight reading on the rod (or minus sights) ELEV = elevation above datum of a point sighted BS Leveling Rod L₁ FSI HI, BM, STOMATO Leveling Rod Horizontal Line of Sight FS BM Elev. of BM₂

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

British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with. 

Question

C.
Leveling Rod
L₁
FS
Leveling Rod
- BS
BM, HI,
TP₁
Elev. of TP,
Leveling Rod
Horizontal
Line of Sight
BS
+
Difference in Elev. between
BM and BM₂
Elev of
BM, (known)
(Do not copy the illustration or drawing)
Table: Determination of Elevation
STATION
BS
HI
FS
ELEVATION
BM1
1.60 m
100 m
TP1
1.47m
0.85
TP2
1.67 m
0.78
TP3
1.54 m
0.89
BM2
0.75
COMPUTATIONS:
1. Computing Height of Instrument and Elevation.
In differential leveling, the following two (2) equations are repeatedly
used
a.) HI Elev + BS
b.) Elev=HI-FS
Where:
HI = height of instrument above a reference datum (MSL)
BS = backsight reading on the rod (or plus sights)
FS = foresight reading on the rod (or minus sights)
ELEV elevation above datum of a point sighted
FS
BM₂
Elev. of BM₂

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