0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What is Line of Collimation in Levelling?
it is line set out by the optical axis of the instrument ( level). so it is just an imaginary line that describes the ray of light that allowes us to read different values from the leveling staff. this term arose from the fact that in differential leveling in surveying we must construct horizontal line of sight, but due to collimation error the collimation line (i.e. line of sight) will not be 100% horizontal (by horizontal we mean tangent the level surface at the instrument position), instead it will be slightly deviated. so what we are looking to achieve when we eliminate the collimation error (using the 2 peg test) is a horizontal line of collimation.
What is an arithmetical set?
An arithmetical set is a set of natural numbers which can be defined by a formula of first-order Peano arithmetic.
How do do guess and check problems without the guess and check method?
you dont.
What is 10 plus 10 is equal to 20?
It is an arithmetical statement.
The part of CPU responsible for arithmetical operations is called?
ALU, the Arithmetic Logic Unit.
What are the advantages and disadvantages of the Height of Collimation method in surveying?
the advantages of this method was that it is more quick and less calculation needed and the disadvantages, it less accurate compare to the rise and fall method.
What are the advantegs of collimation method?
"The collimation method is the height-of-instrument method of leveling whereby fore-and-aft readings are made on a leveling staff by an instrument placed intermediately so that the rise or fall between the fore station and the back station is shown by a change in the staff reading." "The difference between Height of Collimation Method (HCM) and Rise and Fall Method (RFM) are as follows: HCM :It is more rapid and saves a considerable time and labour. RFM : It is laborious as the staff reading of each station is compared to get a rise or fall. HCM : It is well adopted for reduction of levels for construction work such as longitudinal or cross-section levelling operations. RFM : It is well adopted for determining the difference in levels of two points where precision is required. HCM : There is no check on reduction of R.L. of intermediate stations. RFM : There is a complete check on the reduction of RL of the intermediate stations. HCM : There are only two arithmetical checks i.e. the difference between the sum of the fore sights must be equal to be the difference in R.L. of the last station and first station. RFM : There are three arithmetical checks i.e the difference between the sum of the back sights and the sum of fore sights must be equal to the difference between the sum of the rises and the sum of the falls as well as it must also be equal to the difference in RL of the last station and first station. HCM : Errors if any in intermediate sights are not detected. RFM : Errors in intermediate sights are noticed as these are used for finding out rises and falls.
What allows to obtain a total average or other information about the numbers in a range?
Basic arithmetical operations.Basic arithmetical operations.Basic arithmetical operations.Basic arithmetical operations.
What is the height of collimation?
The height of collimation is the height of the line of sight. It is the vertical distance of the horizontal plane through a telescope.
What is a type of collimation device?
diaphragm
Why is collimation used for telescopes?
Collimation is used for telescopes to make sure the telescopes are perfectly aligned. The reflector will not produce the best image if the aligned is not just right.
How can avoid error in spirit leveling collimation error refraction error division of staff?
Collimation Error: Collimation error occurs when the collimation axis is not truly horizontal when the instrument is level. The effect is illustrated in the sketch below, where the collimation axis is tilted with respect to the horizontal by an angle α: Figure ( ) In this particular example, the effect is to read too high on the staff. For a typical collimation error of 20", over a sight length of 50m the effect is 5mm. If the sight lengths for back sight and foresight are equal, the linear effect is the same for both readings. When the height difference is calculated, this effect cancels: δh = (b + s. α) - (f + s. α) = b - f That is, the effect of the collimation error is eliminated if sight lengths are kept equal.
What are the importance of trial balance?
1) check arithmetical accuracy of accounts that you control in ledger 2) make fraud more difficult
Which type of processor performs arithmetical and logical operations?
The type that is appropriately called the "arithmetical and logical unit" (ALU).
What is an arithmetical set?
An arithmetical set is a set of natural numbers which can be defined by a formula of first-order Peano arithmetic.
What is the meaning of the height of collimation?
This term is used in surveying. 'Height of collimation' means height of instrument.Generally this term is used while doing levelling i.e. Measuring elevation of given point.
What is Line of Collimation in Levelling?
it is line set out by the optical axis of the instrument ( level). so it is just an imaginary line that describes the ray of light that allowes us to read different values from the leveling staff. this term arose from the fact that in differential leveling in surveying we must construct horizontal line of sight, but due to collimation error the collimation line (i.e. line of sight) will not be 100% horizontal (by horizontal we mean tangent the level surface at the instrument position), instead it will be slightly deviated. so what we are looking to achieve when we eliminate the collimation error (using the 2 peg test) is a horizontal line of collimation.
