The multiplying constant of the tacheometer is k and the additive constant is c.

What is multiplying constant of theodolite?

The constant, used in stadia work, by which the staff intercept is multiplied to determine the distance between the staff and the theodolite. The value is generally taken as 100.

What are the constants of tacheometer?

Untitled Document. The stadia interval factor (K) and the stadia constant (C) are known as tacheometric constants. Before using a tacheometer for surveying work, it is reqired to determine these constants. These can be computed from field observation by adopting following procedure.

What is the value of additive constant in tacheometer?

8. What is the value of additive constant in anallactic lens? Explanation: If the anallactic lens has been provided in the internal focussing telescope, the additive constant can be reduced to minimal value i.e., zero due to which the computations can be make quicker.

How do you find the multiplication constant?

The multiplying constant in the distance formula by tacheometry is given by

1. focal length of the objective lens divided by the distance between the stadia wires.
2. focal length of the objective lens multiplied by the distance between the stadia wires.
3. stadia intercept divided by the focal length of the objective lens.

Tacheometric constants (multiplying and additive constant)

37 related questions found

What are the multiplying constant and additive constant of a tacheometer?

The multiplying constant of the tacheometer is k and the additive constant is c. Where k is the ratio of focal length of the object lens to stadia hair interval i.e f/i..

When the Anallatic lens are provided in the telescope of a tacheometer the additive constant is kept?

Features of tacheometer or Characteristic of tacheometer

The telescope should be fitted with an anallatic lens to make the additive constant (f + d) exactly to zero. The telescope should be truly analectic.

Which is characteristic of tacheometer?

The essential characteristics of a tacheometer are:

(a) The value of the multiplying constant f/i should be 100. (b) The telescope should be powerful having magnification20 to 30 diameters. (c) The aperture of the objective should be large about 4 cm in diagram in order to have a sufficiently bright image.

What is the multiplying constant of adopting analytic lens in telescope of a tachometer?

Detailed Solution. Explanation: For tachometer: ... If a tachometer is fitted with an anallatic lens, its additive constant is zero and the multiplicative constant is 100.

What is the use of tacheometer?

A tachymeter or tacheometer is a type of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target.

What is the least count of Tacheometer & theodolite?

Least count means the minimum value that an instrument can read .

• theodolite: least count is 20"
• Prismatic compass: least count is 30'
• least count of levelling staff is 5mm.
• dumpy level: least count 5mm as it is based on staff reading thats why least count is 5mm.

What are the systems of Tacheometric measurements?

Different systems of Tacheometric Measurement:

• The various systems of tacheometric survey may be classified as.
• follows:
• ➢ The stadia System.
• (a) Fixed Hair method of Stadia method.
• (b) Movable hair method, or Subtense method.
• ➢ The tangential system.

What is theodolite survey?

The theodolite is an instrument that can measure both horizontal and vertical angles, which allows surveyors to “triangulate” the position of objects in a specific area. While the digital and transit theodolite have been used by land surveyors and engineers, they can be used for other purposes as well.

What should be the aperture required for Tacheometer?

9. What should be the aperture required for tacheometer? Explanation: The magnification of the telescope in tacheometer should be at least 20 to 30 diameters, with an aperture of at least 40 mm for a sufficiently bright image.

What is offset surveying?

Offsets • Lateral measurements to chain lines for locating ground features are known as offsets. For this purpose • perpendicular or oblique offsets may be taken . If the object to be located (say road) is curved more number of offsets should be taken. For measuring offsets tapes are commonly used.

Why analytic lens is provided in tacheometer?

The function of the anallactic lens is to reduce the stadia constant to zero. Thus, when tacheometer is fitted with anallactic lens, the distance measured between instrument station and staff position (for line of sight perpendicular to the staff intercept) becomes directly proportional to the staff intercept.

What is the purpose of providing analytic lens in theodolite?

i. It is an ordinary transit theodolite fitted with an extra lens called analytic lens. The purpose of fitting the analytic lens is to reduce the additive constant to zero.

What is an analytical lens?

Anallatic lens is an additional lens used in the instrument. It is a special lens which is placed between the object glass and the eyepiece of the telescope in order to eliminate the additive constant (f+d).

What is theodolite Slideshare?

THEODOLITE SURVEYINGTHEODOLITE SURVEYING USES OF THEODOLITE The Theodolite is a most accurate surveying instrument mainly used for : • Measuring horizontal and vertical angles. • Locating points on a line. • Prolonging survey lines. • Finding difference of level.

Which of the following is propose of Technometry?

The primary objective of this tacheometric surveying is to prepare contoured maps or plans requiring both the horizontal as well as vertical control. On surveys of higher accuracy, it provides a check on distances measured with the tape.

What do you understand by direct reading tacheometer?

As is well known, the ordinary tacheometer is a theodolite with cross wires or rulings at a fixed distance from one another in the focal plane of the object glass. When a vertically held graduated staff is viewed through the telescope these cross wires make an intercept on the staff.

How does the size of theodolite specified?

The size of a theodolite is defined by the diameter of the graduated circle of the lower plate. For example, a 25 cm theodolite means the diameter of the graduated circle of the lower plate is 25 cm. The size of the theodolite varies from 8-25 cm.

Which of the method of plotting theodolite traverse survey is more reliable?

Question: The most reliable method of plotting a theodolite traverse, is. 4.by the tangent method of plotting.

What is the condition under which the additive constant is zero with an analytic lens?

The object of providing an additional convex lens, called an anallatic lens, in the telescope is to eliminate the additive constant (f+d). That means (f+d) will be zero. The benefit of that is at the time of calculation (f+d)Cosθ and (f+d)Sinθ will be Zero.