Question
Download Solution PDFWhich of the following minor instruments are used for setting out right angles in chain surveying?
1. Cross staff
2. Optical square
3. Prism square
4. Auto level
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe various instruments used in surveying and their purpose is given below in the tabulated form:
|
Survey Instrument |
Purpose |
|
Pegs |
To mark survey stations and endpoints of survey lines on the ground. |
|
Arrows |
To mark the position of the end of the chain or tape on the ground. |
|
Ranging Rods |
For locating a number of points on a long survey line. |
|
Offset Rods |
To set out offset lines at right angles. |
|
Prism Square |
Setting out right angles |
|
Plumb Bob |
To indicate whether the line is vertical or not. |
|
Clinometers |
To measure the slope of the ground. |
|
Optical Square |
To set out right angles |
|
Prismatic Square |
Advanced version of Optical square and used to set out right angles |
|
French Cross Staff |
Used to set out either 45° or 90°. |
|
Open Cross staff |
Type of cross-staff which is also used to set out 900. |
|
Theodolite |
For measurement of all horizontal and vertical angles |
|
Dumpy Level |
Measurement of Angles and Elevation |
|
Auto Level |
For Levelling purpose. |
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