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What Is Collimation Error In Levelling

Is error comes when the line of sight does not coincide with the optical axis of theodolite. 4 people found this useful Edit Share to: Syiqa 7 Contributions What are Brick wall repair Is absence of Plinth Beams a major Issue? Your cache administrator is webmaster. When represented graphically circle eccentricity appears as a sine wave.

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Over time, the sum of these two angles may diverge from 360° and consequently cause errors in vertical angle measurements. Accuracy requirements may dictate that more than one set of angles and distances is measured to each point. Answered In Uncategorized What is collimate? An emulsion is then applied to the circle and a photo-reduced image of the master is projected onto the circle.

  1. This will cause the magnetic compass to precede when turning to a northern heading, and to lag when turning to a southern heading. 7 people found this useful Idontknow00 8 Contributions
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  3. These instruments are functioning exactly as designed when this happens.(3) When prolonging a line with an electronic theodolite, the instrument operator should either turn a 180-degree angle or plunge the telescope

Vibrations can cause the compensator to be unstable.i) Collimation errors When sighting points a single time (e.g., direct position only) for elevations, check the instrument regularly for collimation errors.j) Vertical angles This was a help to me: from google books. Merge this question into Split and merge into it SAVE CANCEL Edit Answered by The WikiAnswers Community Making the world better, one answer at a time. Follow Megan Dorsey College Admissions expert and savvy SAT Prep Instructor Follow Log in or Sign Up to follow.

Follow Alexis Avila Alexis Avila, MS founded Boston-area tutoring and test prep firm Prepped & Polished, LLC in 1999. d) Circle graduation error In the past, circle graduation error was considered a major problem. your links did works for me... 4 people found this useful Stranger941 5 Contributions What is the syntax error and logic error? What is the grade of concrete(M20/M25 etc.) normally used in roof casting?

Flag What is collimation error? These are scanned by fixed and moving light sensors. SAVE CANCEL already exists. Precise elevations of the points along the baseline should be measured by differential leveling.

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. http://www.boeingconsult.com/tafe/ss&so/survey1/level/notes-sur1.htm LoginLogin with: Forget Remember Me Lost PasswordLost your password? Then a correction factor is stored in ROM that adds or subtracts from each angle reading so that a corrected measurement is displayed. (2) Other instruments employ an angle-measuring system consisting What is Line of Collimation in Levelling?

Error is from the latin root 'errorus', meaning pony 6 people found this useful Edit Share to: Answered by The WikiAnswers Community Making the world better, one answer at a In aviation, compasses may also give erroneous readings when turning or performing other maneuvers. Generated Wed, 02 Nov 2016 01:22:44 GMT by s_wx1196 (squid/3.5.20) Your cache administrator is webmaster.

This is due to the curvature of the earth combined with the fact that the compass needle wishes to point at the magnetic north pole. Answer these Why was Pope John Paul II declared a saint? In: Religion & Spirituality Answer it! Generated Wed, 02 Nov 2016 01:22:44 GMT by s_wx1196 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.8/ Connection

This would include total stations with laser plummets.m) Adjustment of prism polesWhen using prism poles, precautions should be taken to ensure accurate measurements. Yes Somewhat No Thanks for the feedback! For example, if the surveyor normally shoots a fire hydrant at the ground level, but for some reason shoots it on top of the operating nut, erroneous contours would result if

Answered In Business and Industry What are the advantages and disadvantages of the Height of Collimation method in surveying?

Comparing the two sets of elevations provides a check on the accuracy and adjustment of the instrument. The following paragraphs provide the major sources of error when using a theodolite and also the particular method employed to compensate for that error. Answered In Chemistry What are percentage errors? To test for horizontal collimation error, point to a target in face one then point back to the same target in face two; the difference in horizontal circle readings should be

Since a value can't be less than 0 and greater than 5, a logical error will occur. 4 people found this useful ThePrism Group 304,969 Contributions I AM GILGAMESH. . . One must now do more than memorize techniques that compensate for errors. I wish you eternal joy. * The infinite proceeds from infinite. If possible, use a center punch to make a dent or hole in both the upper and lower marks.

Please try the request again. Categories Bridges and Tunnels Engineering Technology Home New questions Recent site activity Random question Promoted questions Community forums Advanced search Top contributors Q&A categories © 2016 Answers About Contact Us Help As stated before there is no such thing as perfection in the physical world. When the height difference is calculated, this effect cancels:       δh = (b + s. α) - (f + s. α) = b - f 

Measuring elevation of given point. 8 people found this useful Edit Share to: Answered by The WikiAnswers Community Making the world better, one answer at a time.