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Note for Surveying-1 - s-1 by Noor Mohd

  • Surveying-1 - s-1
  • Note
  • JNTU - JNTU
  • Civil Engineering
  • B.Tech
  • 2 Topics
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Text from page-2

1.2.1 Transit theodolite: - A theodolite is said to be a transit then its telescope can be revolved through 180° in a vertical plane about its horizontal axis. The transit type is largely used, while the other two types have now become obsolete. Fig.- tansist theodolite 2

Text from page-3

1.2.2 Non-transit theodolite: - A theodolite is said to be a nontransit when its telescope cannot be revolved through 180° in a vertical plane about its horizontal axis. Fig.-non transit theodolite 3

Text from page-4

1.3 The essentials parts of the theodolite: 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Telescope Vertical Scale (or Vertical Circle) The index frame Vertical Clamp and Tangent Screw Upper Plate The Lower Plate Horizontal Scale (or Horizontal Circle) The Upper Horizontal Clamp and Tangent Screw. The Lower Horizontal Clamp and Tangent Screw. The Plumb Bob Leveling screw Tripod All of these parts are explained in following:- 1. Telescope: - 2. The vertical circle: - 3. The index frame: - the index frame is a t-shaped frame consisting the telescope is an integral part of the theodolite and is mounted on a spindle known as horizontal axis or trunnion axis. The vertical circle is a circular graduated arc attached to the trunnion axis of the telescope. of a vertical leg known as clipping arm and a horizontal bar is known as vernier arm or index arm. 4. The upper plate:- The upper plate is the base on which the standards and vertical circle are placed. 4

Text from page-5

5. The lower plate:- The 6. Horizontal Scale: - It is used to define the horizontal direction lower plate is the base of the whole instrument. It houses the foot screws and the bearing for the vertical axis. in which the telescope is sighted. 7. Tripod: 8. The Plumb Bob: - a plumb bob is suspended from the hook fitted to - The theodolite is supported on a tripod which consists of three solid or framed legs. At the lower ends, the legs are provided with pointed steel shoes. the bottom of the inner axis to centre the instrument exactly over the station mark. 9. Vertical Clamp: 10. Leveling screw: - The horizontal plates can be leveled by means of - In order to hold the telescope at a particular vertical angle a vertical clamp is provided. three foot screws located beneath the lower plate, in a similar way to a level. 11. The Upper Horizontal Clamp and Tangent Screw:The upper horizontal clamp is provided to clamp the upper plate to the horizontal circle. Once the clamp is released the instrument is free to traverse through 360° around the horizontal circle. 12. The Lower Horizontal Clamp and Tangent Screw:The lower horizontal clamp is provided to clamp the horizontal circle to the lower plate. Once the clamp is released the circle is free to rotate about the vertical axis. When clamped, the horizontal circle can be gradually rotated using the lower-horizontal tangent screw. 5

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