Which dumpy level

The height of the staff where the level beam crosses the staff is shown on a digital display. This type of level removes interpolation of graduation by a person, thus removing a source of error and increasing accuracy.

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They are provided to align the level of instrument. Provided by bubble tubes on horizontal and vertical direction. The instrument is ready to survey when both the bubbles are in the centre. Compass It is used to determine the magnetic bearing of the line of the path of the survey. The compass comprises of pointer on marking of directions. The compass is aligned for the magnetic bearing in the north direction. Located at the centre of the instrument. It helps the telescope to rotate in the vertical direction.

Vertical Spindle is meant to be a conjunction point between tripod and telescope. It is parallel to the levelling head and primarily utilised to adjust the horizontal level of the instrument. The trivet is connected through foot screws. The foot screws are used to calibrate the instrument through the bubble tube.

Adjusting foot screws one can calibrate tribrach plate. To ensure the bubble is at the centre, foot screws are operated. Also known as a trivet, it comprises of two triangular plates aligned parallel to each other.

Comprises of groves to hold foot screws. Tripod is the supporting medium of the complete dumpy level. Comprising of three legs made of hollow steel sections or light or hardwood. Steel shoes provided at the foot ensures that the tripod is immobile with slight jerks. The step by step procedure to perform the surveying using Dumpy level.

Survey through a dumpy level can be easily conducted over a site. The dumpy level is a two-man procedure, one may require at least an assistant to proceed with the operation.

Below listed types of equipment are the one that one requires to initiate the surveying operation. Once the above instruments are available, the surveying operation can proceed.

Following steps needs to be followed to complete with the surveying operation. This previous data of benchmark can be acquired from previous surveys. Benchmark data is usually found on churches, govt buildings, municipal offices, Railway station boards, etc.

If data is not available, one may choose an arbitrary point temporary benchmark like fence post etc with an assumed height. You can look up the benchmarks of your location from here. In the above Railway Board, you can see Mean sea level is mentioned. If the spot is too high or far away for you to measure, move your staff to a lower, closer spot first. Find the height of this new spot, then move your dumpy level to it and restart the measuring process.

This will give you the height of the spot you measured. When your record this height, make sure to include a thorough description or diagram of the spot you measured. It can be used in archaeology to measure the height above sea level of archaeological features, so they can be accurately recorded on plans.

Not Helpful 3 Helpful Benchmark information is usually written on the monuments supplied by the area you are surveying in. Not Helpful 7 Helpful Not Helpful 4 Helpful While taking a backsite reading to a reference point , to align the arrow on the measurement ring with the marking on the upper rotating part of the dumpy level the reference marking is made aligning the focusing line. While taking a foresite reading, the upper part rotates while the ring on which angles are written will not rotate.

The reading marked by the reference marking of the upper portion is the horizontal angle between two points. Not Helpful 5 Helpful 6. Include your email address to get a message when this question is answered. Submit a Tip All tip submissions are carefully reviewed before being published. Related wikiHows How to. How to. More References 4. About This Article. Co-authored by:. Co-authors: 3. Updated: November 19, These products were built for more advanced surveying tasks that require accuracy over large distances.

Another well-known market provider is Topcon. They supply and provide mature, easy to use, feature rich and versatile tools. Their lasers are highly refined and designed to assure you are getting the best and most accurate results every time. Thanks to the finely tuned auto-collimation system, the Topcon ATB4 autolevel is an ideal device for determining height differentials on busy and noisy job sites!

We have this available for hire or purchase as well as our convenient calibration and repair service to help guarantee optimum long-term performance. View Our Accessories ». There are a wide range of different levels that can be used for a variety of different applications, such as:. Deciding you want or need a level is the first step, next you will need to decide whether buying or hiring is best for you. Buying a level outright can be ideal for those customers who know they will be using it regularly, especially as some levels can be relatively inexpensive.

Buying vs Hiring ». Call Sales Hire Servicing Training. Create your account Lost password? First name. Last name. Manuals Total Station Manuals. What is a level? Levels: To Buy or Hire?

We hope our guide to levels helps you make the right decision! View Our Levels » 1. Factors to Consider When Choosing the Right Level There are many different levels available so there is a lot to consider when trying to choose the right one for you. Here are some things to consider: Accuracy : Levels are more accurate than other tools but some more so than others.