Auto Level, Dumpy Level and Tilting Level – Introduction and Definition
In surveying, levelling instruments are used to determine the difference in elevation between points on the ground. Among the commonly used instruments are the Auto Level, Dumpy Level, and Tilting Level. In ITI Draughtsman Civil, understanding the introduction and definition of these instruments is essential for accurate levelling work.
1. Auto Level
Introduction
The auto level is a modern levelling instrument that automatically maintains a horizontal line of sight with the help of an internal compensator. It is widely used in construction and surveying due to its speed and accuracy.
Definition
An auto level is a self-leveling instrument that uses an automatic compensating mechanism to establish a horizontal line of sight for measuring elevations.
Features
- Automatic leveling system.
- High accuracy and reliability.
- Easy and quick to use.
- Suitable for large and precise projects.
2. Dumpy Level
Introduction
The dumpy level is a traditional levelling instrument widely used for general surveying work. It is simple, strong, and provides accurate results when properly adjusted.
Definition
A dumpy level is a levelling instrument in which the telescope is rigidly fixed to its supports and cannot be rotated about its longitudinal axis.
Features
- Strong and durable construction.
- Requires manual leveling using leveling screws.
- Provides stable and accurate readings.
- Commonly used in basic levelling work.
3. Tilting Level
Introduction
The tilting level is an improved type of levelling instrument in which the telescope can be slightly tilted for precise leveling. It allows quick adjustments and is more convenient than a dumpy level.
Definition
A tilting level is a levelling instrument in which the telescope can be tilted slightly about its horizontal axis using a tilting screw to achieve accurate leveling.
Features
- Telescope can be tilted for fine adjustment.
- Provides more precise leveling.
- Faster setup compared to dumpy level.
- Requires careful handling.
4. Comparison of Instruments
| Instrument | Special Feature | Accuracy | Ease of Use |
|---|---|---|---|
| Auto Level | Automatic leveling | High | Very easy |
| Dumpy Level | Rigid telescope | Moderate | Manual effort required |
| Tilting Level | Tilting telescope | High | Easy with adjustment |
Importance in Surveying
These levelling instruments are widely used in construction and surveying projects for determining elevations, preparing contour maps, and setting out levels.
Role of Draughtsman Civil
A Draughtsman Civil uses levelling data obtained from these instruments to prepare profiles, sections, and plans. Proper knowledge of these instruments helps in accurate interpretation of field data.
Conclusion
Auto level, dumpy level, and tilting level are important instruments used in levelling. Each has its own features and applications, but all are used to determine accurate elevations.
For ITI Draughtsman Civil students, understanding their introduction and definitions is essential for effective surveying and construction work.