Object: To measure the horizontal distance between two terminal stations by different methods (measuring tape, chains, and perambulator).
Instruments required:
- Ranging rods
- Chains (Engineering, Metric and Gunter’s)
- Fiberglass tape
- Perambulator
- Arrow
Theory :
In case of large distance or measurement of distance on uneven ground, due to natural factors like sage produced in chaining due to wind or unevenness of ground which may result in inaccurate horizontal distance, the survey line is then required to be divided in different parts and needs to be ranged in order to get accurate distance.
Procedure:
- Locate the polygon that is to be measured.
- The follower places tape at first terminal station, then the surveyor stretches it to the intermediate ranged station, measures distance d1 and notes it in the field book.
- The follower then shifts to first ranged station and places tape there, the surveyor then stretches tape to next ranged station and measures d2.
Note: If the survey line is greater than the length of tape, arrow is used to fix the intermediate point where the tape ends, and then the measurement is taken from arrow to the other intermediate ranged station.
- In this way repeat the procedure upto last terminal station and measure all broken distances.
- Record all small distances in field book and calculate the total distance by adding all small distances.
- The above mentioned procedure is also carried out with different chains.
- Perambulator counts the steps and calculates the horizontal distance in meters.
Results:
Terminal Station | Fiberglass tape measure (ft) | Metric chain reading (m) | Engineering chain reading(ft) | Perambulator reading(m) |
AB | ||||
BC | ||||
CD | ||||
DE | ||||
EA | ||||
Fiberglass tape measure (m) | Gunter’s chain reading (ft) | |
AB | ||
BC | ||
CD | ||
DE | ||
EF | ||
Calculations:
Reading with tape(ft)
Reading with tape(m)
Reading with Engineering chain(ft)
Reading with Gunter’s chain(ft)
Reading with Metric chain(m)
Reading with Perambulator(m)
