Besides the measurements of angles, it may also be used for prolonging the survey lines, establishing grades, locating points on a line, determining the differences in level, etc. Plumb Bob. The circular or trough type compass box is attached to the instrument. The tripod head has male screws on that the trivet of the leveling head is screwed. The nature of graduations depends upon the size of the instrument; It may be graduated to degrees and half degrees and one-third of a degree or degrees and one-sixth of a degree. These two theodolite parts or standards, which resemble the letter A in shape, stand on the upper plates for supporting the horizontal axis. Optical Sights - used to observe a particular point. Each type has a different mode of operation. The least count of the vertical circle vernier is usually the same as that of horizontal circle verniers. Procedure : To start the cross staff survey ,a chain line is run through the centre of the area to. This Theodolite Part is used to sight distant objects. It is helpful to centralize the complete instrument over the positioning. saqa. The tripod should be rigid. A compass measures the direction by measuring the angle between the line and a reference direction, which is the magnetic meridian. But here in this article, you’ll understand the common and essential parts of theodolite. author avatar tv tropes. Different Parts of Theodolites: There are several types of theodolites based on their distinctive specifications and function. THEODOLITE: Parts and Functions Carrying Handle - is where the theodolite is carried by the surveyors. A sight on the top of the telescope is used to align the target. What is Scaffolding? Component parts of Theodolite with explanation of each part and functions Get link; Facebook; Twitter; Pinterest; Email; Other Apps - December 13, 2018 THEODOLITE OBJECTIVE: The main objective of theodolite is to measure both the horizontal and vertical angles. The circuiar holder with the horizontal circle is located outside on the axis sleeve; it can be turned by the setting knob (6), fitted on the tapered theodolite base and protected by a cap. It is one of the most precise instruments available for the angular measurements in the market. They are inferior in utility and have now become obsolete. Procedure, Methods, What is Tacheometer? 1. A digital theodolite consists of a telescope that is mounted on a base. An objective lens is present on the opposite side of the telescope used to sight and magnify the target as required. Features of Tacheometer, Advantages & Disadvantages of Dumpy Level, Advantages and Disadvantages of Auto Level, Difference between Dumpy Level and Auto Level. In its modern form it consists of a telescope mounted to swivel both horizontally and vertically. Unlike a lot of other equipment used by surveyors, such as RTK receiver systems, a dumpy level only takes measurements in one plane, the vertical plane. The horizontal wing helps to require the measurement of vertical angles and the vertical wing helps to grip the telescope at the wanted level. Use of Digital theodolite in Surveying & Leveling, Surveying Engineering. Theodolite consists of some main parts, such as: These theodolite parts are discussed briefly below. 2. Plate levels facilitate the telescope to mend incorrect vertical points. Without regulation of the parts cannot be worked accurately. Plate level- Plate levels are lifting by the upper plate that is the proper angles to every different with one they are coordinate to trunnion axis. The first occurrence of the word "theodolite" is found in the surveying textbook A geometric practice named Pantometria (1571) by Leonard Digges. Theodolite has many parts which needs to be adjusted every time while surveying. The outer spindle is hollow whose interior is formed conical to accommodate the central vertical axis or inner axis which is solid and conical. Vertical circle is another important theodolite parts, a circular graduated ring is attached to the horizontal. Transit levels are very precise. The legs may be solid or framed, but the solid leg tripod is most common. Its Types, Parts Used in Construction. The angle to the desired point is measured … This part of the theodolite is also known as the vernier plate and is attached to the inner axis. Leveling is it is strictly connected to the tripod-escalating assembly and does not modifier or shift. It homes the foot screws and the carrying for the vertical axis. INTRODUCTION Until recently, transits and theodoliteswere the most commonly used surveying instruments for angle measurements for angle measurement. The cord is provided with a slip knot to allow the plummet to be adjusted at the desired level. The clamp and tangent screws of the vertical circle help in setting up of any desired position accurately in a vertical plane. Dumpy Level Parts & Functions. 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