Last edited by Samugami
Sunday, May 10, 2020 | History

2 edition of Backsight and foresight. found in the catalog.

Backsight and foresight.

Shepherd, F. A.

Backsight and foresight.

by Shepherd, F. A.

  • 289 Want to read
  • 13 Currently reading

Published by Incorporated Association of Architects and Surveyors in [Northampton] .
Written in English


Edition Notes

Paper to be presented to the Incorporated Association of Architects and Surveyors at their one-day symposium "Land, building and computers", Fri. 15th April, 1983.

ContributionsIncorporated Association of Architects and Surveyors., Land, Building and Computers (Conference) (1983)
The Physical Object
Pagination18p. :
Number of Pages18
ID Numbers
Open LibraryOL13834708M

4) STEP Take side shots: Once you take the backsight reading, the elevation of the instrument can be calculated. Now you need to take shots at the centerline of the bike path according to the following procedures: a. At all 25 ft stations (i.e. 0+00, 0+25, 0+50, 0+75, 1+00, etc.) beginning from point 0+00 and ending at point 9+ b. Record all your backsight, side shot, and foresight.   Backsight (BS) The first reading of the instrument set up at the first point. Intermediate Sight (IS) The reading between the backsight and foresight. Foresight (FS) The final reading of the instrument. Change point (C.P.) A transfer point of the levelling. A new point which the previous point of the backsight and foresight are taken.

  In this operation, the backsight, intermediate sight and foresight readings are taken at regular intervals, at every set up of instrument. The chainages of the points are noted in the level book. This operation is undertaken in order to determine the undulation of the ground surface along the profile line (Fig. – L). h (r 1 r 2) (D 1 D 2) CR ()2 (D21 D 2 2) h (r BS r FS) (D BSD FS) CR (D2 D2FS) PLATE COMBINED EFFECT OF SYSTEMATIC ERRORS For an individual setup: where h is the corrected difference in elevation, r 1 is the backsight rod reading, and r 2 is the foresight .

Complete the set of level notes below, including backsight and foresight sums and other math checks. The elevation for BM MER is feet MSL. The survey distance for the total loop is feet. a. To achieve a high degree of accuracy more reading of one value needs to be made: to cancel some instrument systematic errors, make readings with telescope sight forward. Once reading of backsight and foresight is finished, rotate the telescope around its trunnion axis to make other reading: from foresight .


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Backsight and foresight by Shepherd, F. A. Download PDF EPUB FB2

Backsight and foresight on land use [marginal land in central oregon] paperback – january 1, by W.A. Rockie (Author)Author: W.A.

Rockie. “Foresight provides refreshing new evidence, primarily from biology, that science needs to open its perspective on the origin of living things to account for the possibility that purely natural, materialistic evolution cannot account for these facts.

The book is written in an easy-to-read style that will be appreciated by scientists and non-scientists alike and encourages the reader to follow the truth /5(59). Professional Foresight Books – A Longer List 20/20 Foresight: Crafting Strategy in an Uncertain World, Hugh Courtney (); A Brief History of the Future, Oona Strathern (); A Field Guide to Lies (and Statistics), Daniel Levitin () Accelerate: Building Strategic Agility for a Faster-Moving World, John Kotter (); Against the Gods: The Remarkable Story of Risk, Peter Bernstein ().

Top Introductory Foresight Books – A Starter List. These are my current most-recommended reads for Introductory Foresight, in two categories: Big Picture Vision books (where our civilization is going, and why certain kinds of change will likely run faster every year for the rest of our lives) and Foresight Process and Culture books (what foresight is, and how to do better and wiser future.

It appeared in the British United Service Magazine under the pseudonym, Lieutenant N. Backsight Forethought ("BF"), who is the narrator of the book. The book is an exploration of small unit tactics in a fictional encounter in the Boer War.

Backsight, intermediate sight and forsight readings are entered in the appropriate columns on different lines. However, as shown in the table above backsights and foresights are place Backsight and foresight. book the same line if you change the level instrument.

It is important for you to understand exactly what "backsight" and "foresight" are in direct levelling. A backsight (BS) is a sight taken with the level to a point X of known elevation E(X), so that the height of the instrument HI can be found.

A backsight in direct levelling is. CIVIL_ENGINEERING (a) Setting up: Backsight and foresight distances should be approximately equal to avoid any errors due to collimation, refraction or earth curvature. Distances must not be so great as to not be able to read the graduations accurately. The points to be observed must be below the level of the instrument, but not.

A graduated staff is held vertically over the first point and a reading made of the intersection of the cross-hair with the image of the staff (backsight - b). The same (or an identical) staff is then held vertically over the second point and a further reading made (foresight - f).

Find the elevation of a point at the end of an open traverse, when provided the elevation of a point at the beginning of the traverse, and the intermediate foresight and backsight measurements.

The united geodetic vertical network of Latvia and Lithuania. Shortly after the Boer War, a British Major General named Sir Earnest Swinton, using the pseudonym Lieutenant Backsight Forethought, or BF, wrote The Defence of Duffer's Drift.

Duffer's drift. is that backsight is (surveying) to shoot a backsight while foresight is (surveying) a bearing taken forwards towards a new object. As nouns the difference between backsight and foresight is that backsight is the rear sight of a firearm while foresight is the ability to foresee or prepare wisely for the future.

As a verb backsight is (surveying) to shoot a backsight. Back Sight. A back sight (B.S) is the first staff reading taken after setting up the instrument in any position.

This will always be a reading on the point of known elevation. Fore Sight. A fore sight (F.S) is the last staff reading taken before moving the instrument. This will always be reading on a point whose elevation is to be determined.

Backsight definition is - a reading of the leveling rod in its unchanged position when the leveling instrument has been taken to a new position. Books shelved as strategic-foresight: 4 Steps to the Future: A Quick and Clean Guide to Creating Foresight by Richard a K Lum, Strategic Foresight: Learn.

Levelling & Surveying NIWA: April Pacific Island Hydrology Course, Fiji Page 1 However if a backsight and a foresight are exactly equi-distant from the instrument, the Book these values and calculate the apparent height differenceFile Size: KB.

The initial backsight (BS)is taken to a point of known elevation The backsight reading is added to the elevation of the known point to compute the height of the instrument (HI) The level may be moved to a temporary point called a turning point (TP) The elevation of a point is the height of the instrument (HI) minus the foresight (FS)File Size: KB.

Backsight and foresight distances should be approximately equal to avoid any errors due to collimation, refraction or earth curvature. Distances must not be so great as to not be able to read the graduations accurately. The points to be observed must be below the level of the instrument, but not lower than the height of the staff.

Backsight definition: the sight of a rifle nearer the stock | Meaning, pronunciation, translations and examples. A reading taken on a level rod held in its unchanged position on a survey point of previously determined elevation when the leveling instrument has been moved to a new position.

It is used to determine the height of the instrument prior to making a foresight. Abbrev: BS. Ant: foresight. The rear sight of a firearm.

(surveying) A measurement or reading taken back towards a point of known elevation, used to calculate the height of the surveying instrument (theodolite, transit, total station).

(surveying) A measurement of a previously shot point, used to set the angle to zero when occupying a new position.(surveying) To shoot a.7. In differential leveling, balancing the backsight and foresight distances is necessary in order to mainly avoid: a.

Propagation of errors due to the effect of parallax. b. The effect of the refraction and Earth's curvature on the backsight measurements. c. Instrumental errors causing the line of sight to deviate from the horizontal plane. d.Get Textbooks on Google Play. Rent and save from the world's largest eBookstore.

Read, highlight, and take notes, across web, tablet, and phone/5(13).