Left thumb rule in levelling.

Question

Want to see more full solutions like this?

Answer 1

Question

Chapter 5, Problem 5.1P

To determine

Left thumb rule in levelling.

Expert Solution & Answer

Explanation of Solution

Left thumb rule is applicable in leveling for the measurement of vertical angles. In order to use the instruments effectively we must follow some of the basic principles.

Most of the latest instruments use three screw leveling head for initial rough leveling. In leveling a three-screw head, the telescope is rotated until it is over two screws that is, horizontal to the two screws, and then by using the thumb and the first finger of each hand in order to adjust the opposite screws simultaneously fixing the bubble approximately at the center (if the left thumb is turned to the left as moving right thumb to right it will turn the bubble towards left, similarly moving left thumb to right and right thumb to left will make the bubble to move towards right). The whole procedure is repeated with the telescope at 90^oso that it is over the third remaining screw just opposite the other two. Now, a lot of time gets wasted while adjusting the bubble with the first attempt.A simple rule that assists in centering bubble, as a bubble follows the left thumb rule when turning the screws gets centered by turning the screws one after the other. Furthermore, the inward and outward movement of the foot screws will easily center the instrument and telescope need not to be rotated throughout the process.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Students have asked these similar questions

A farm of 40 hectares is supplied by open field drains. The spacing of these drains were selected to be 100m and the length of each drain is 600 m. If the drainage coefficient is 4 cm/day, find: 1- Discharge at the end of a field drain. 2- Total discharge passed through the collector drain. 3- The dimension of open drains, if n= 0.03, S= 0.00035 and Z= 1.5

Please use stiffness matrix method to solve.

Please answer using the stiffness matrix method

Answer 2

Question

Chapter 5, Problem 5.1P

To determine

Left thumb rule in levelling.

Expert Solution & Answer

Explanation of Solution

Left thumb rule is applicable in leveling for the measurement of vertical angles. In order to use the instruments effectively we must follow some of the basic principles.

Most of the latest instruments use three screw leveling head for initial rough leveling. In leveling a three-screw head, the telescope is rotated until it is over two screws that is, horizontal to the two screws, and then by using the thumb and the first finger of each hand in order to adjust the opposite screws simultaneously fixing the bubble approximately at the center (if the left thumb is turned to the left as moving right thumb to right it will turn the bubble towards left, similarly moving left thumb to right and right thumb to left will make the bubble to move towards right). The whole procedure is repeated with the telescope at 90^oso that it is over the third remaining screw just opposite the other two. Now, a lot of time gets wasted while adjusting the bubble with the first attempt.A simple rule that assists in centering bubble, as a bubble follows the left thumb rule when turning the screws gets centered by turning the screws one after the other. Furthermore, the inward and outward movement of the foot screws will easily center the instrument and telescope need not to be rotated throughout the process.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Question

Chapter 5, Problem 5.1P

To determine

Left thumb rule in levelling.

Expert Solution & Answer

Explanation of Solution

Left thumb rule is applicable in leveling for the measurement of vertical angles. In order to use the instruments effectively we must follow some of the basic principles.

Most of the latest instruments use three screw leveling head for initial rough leveling. In leveling a three-screw head, the telescope is rotated until it is over two screws that is, horizontal to the two screws, and then by using the thumb and the first finger of each hand in order to adjust the opposite screws simultaneously fixing the bubble approximately at the center (if the left thumb is turned to the left as moving right thumb to right it will turn the bubble towards left, similarly moving left thumb to right and right thumb to left will make the bubble to move towards right). The whole procedure is repeated with the telescope at 90^oso that it is over the third remaining screw just opposite the other two. Now, a lot of time gets wasted while adjusting the bubble with the first attempt.A simple rule that assists in centering bubble, as a bubble follows the left thumb rule when turning the screws gets centered by turning the screws one after the other. Furthermore, the inward and outward movement of the foot screws will easily center the instrument and telescope need not to be rotated throughout the process.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Question

Chapter 5, Problem 5.1P

To determine

Left thumb rule in levelling.

Expert Solution & Answer

Explanation of Solution

Left thumb rule is applicable in leveling for the measurement of vertical angles. In order to use the instruments effectively we must follow some of the basic principles.

Most of the latest instruments use three screw leveling head for initial rough leveling. In leveling a three-screw head, the telescope is rotated until it is over two screws that is, horizontal to the two screws, and then by using the thumb and the first finger of each hand in order to adjust the opposite screws simultaneously fixing the bubble approximately at the center (if the left thumb is turned to the left as moving right thumb to right it will turn the bubble towards left, similarly moving left thumb to right and right thumb to left will make the bubble to move towards right). The whole procedure is repeated with the telescope at 90^oso that it is over the third remaining screw just opposite the other two. Now, a lot of time gets wasted while adjusting the bubble with the first attempt.A simple rule that assists in centering bubble, as a bubble follows the left thumb rule when turning the screws gets centered by turning the screws one after the other. Furthermore, the inward and outward movement of the foot screws will easily center the instrument and telescope need not to be rotated throughout the process.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Chapter 5, Problem 5.1P

To determine

Left thumb rule in levelling.

Expert Solution & Answer

Explanation of Solution

Left thumb rule is applicable in leveling for the measurement of vertical angles. In order to use the instruments effectively we must follow some of the basic principles.

Most of the latest instruments use three screw leveling head for initial rough leveling. In leveling a three-screw head, the telescope is rotated until it is over two screws that is, horizontal to the two screws, and then by using the thumb and the first finger of each hand in order to adjust the opposite screws simultaneously fixing the bubble approximately at the center (if the left thumb is turned to the left as moving right thumb to right it will turn the bubble towards left, similarly moving left thumb to right and right thumb to left will make the bubble to move towards right). The whole procedure is repeated with the telescope at 90^oso that it is over the third remaining screw just opposite the other two. Now, a lot of time gets wasted while adjusting the bubble with the first attempt.A simple rule that assists in centering bubble, as a bubble follows the left thumb rule when turning the screws gets centered by turning the screws one after the other. Furthermore, the inward and outward movement of the foot screws will easily center the instrument and telescope need not to be rotated throughout the process.

Answer 6

Chapter 5, Problem 5.1P

To determine

Left thumb rule in levelling.

Expert Solution & Answer

Explanation of Solution

Left thumb rule is applicable in leveling for the measurement of vertical angles. In order to use the instruments effectively we must follow some of the basic principles.

Most of the latest instruments use three screw leveling head for initial rough leveling. In leveling a three-screw head, the telescope is rotated until it is over two screws that is, horizontal to the two screws, and then by using the thumb and the first finger of each hand in order to adjust the opposite screws simultaneously fixing the bubble approximately at the center (if the left thumb is turned to the left as moving right thumb to right it will turn the bubble towards left, similarly moving left thumb to right and right thumb to left will make the bubble to move towards right). The whole procedure is repeated with the telescope at 90^oso that it is over the third remaining screw just opposite the other two. Now, a lot of time gets wasted while adjusting the bubble with the first attempt.A simple rule that assists in centering bubble, as a bubble follows the left thumb rule when turning the screws gets centered by turning the screws one after the other. Furthermore, the inward and outward movement of the foot screws will easily center the instrument and telescope need not to be rotated throughout the process.

Answer 7

Chapter 5, Problem 5.1P

To determine

Left thumb rule in levelling.

Answer 8

Expert Solution & Answer

Explanation of Solution

Left thumb rule is applicable in leveling for the measurement of vertical angles. In order to use the instruments effectively we must follow some of the basic principles.

Most of the latest instruments use three screw leveling head for initial rough leveling. In leveling a three-screw head, the telescope is rotated until it is over two screws that is, horizontal to the two screws, and then by using the thumb and the first finger of each hand in order to adjust the opposite screws simultaneously fixing the bubble approximately at the center (if the left thumb is turned to the left as moving right thumb to right it will turn the bubble towards left, similarly moving left thumb to right and right thumb to left will make the bubble to move towards right). The whole procedure is repeated with the telescope at 90^oso that it is over the third remaining screw just opposite the other two. Now, a lot of time gets wasted while adjusting the bubble with the first attempt.A simple rule that assists in centering bubble, as a bubble follows the left thumb rule when turning the screws gets centered by turning the screws one after the other. Furthermore, the inward and outward movement of the foot screws will easily center the instrument and telescope need not to be rotated throughout the process.