Height of collimation booking sheet examples

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Jul 24, 2013 · This video shows you how to calculate out the Height of Collimation Level Book as an alternative method of working out the Reduced Level of the points that you have surveyed. If you like this ... It is also known as ‘height of instrument’. It should not be confused with the height of telescope from the ground where the instrument is set. (ii) Back Sight (BS): It is the sight taken on a level staff held on the point of known elevation with an intension of determining the plane of collimation. It is always the first reading after the ... BASICS OF LEVELLING. USES OF LEVELLING. In the context of tidal measurements, levelling is used for the following purposes: Referencing of Tide Gauges: To determine and check the vertical stability of the tide gauge bench mark (TGBM) with respect to reference points (benchmarks) in its immediate vicinity. BASICS OF LEVELLING. USES OF LEVELLING. In the context of tidal measurements, levelling is used for the following purposes: Referencing of Tide Gauges: To determine and check the vertical stability of the tide gauge bench mark (TGBM) with respect to reference points (benchmarks) in its immediate vicinity. Collimation Method: (The height of collimation is the height of the horizontal line of sight above the datum, and is sometimes called the height of instrument). In order to understand this you should watch the ‘Calculating the Height of Collimation’ video below. Rise and Fall Method: Advantages of the two methods of booking:
 

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height electronically without actually measuring the distances on the ground. (Ref Fig 3.6 for Dumpy level and Fig 3.7 for modern automatic leveling machine) 3.6.1 Words used in leveling survey works 1. Station: It is a point on the ground where the leveling staff is kept (erect position) for measuring the height of line of collimation. 2.
 

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(3) When prolonging a line with an electronic theodolite, the instrument operator should either turn a 180-degree angle or plunge the telescope and turn the horizontal tangent so that the horizontal circle reading is the same as it was before plunging the telescope.

is a separate field book available for working out reduced levels (RL). The RL can be computed in two ways (1) Height of Collimation (2) Rise and Fall method. The HC method is a very simple method, less tedious method quicker than rise and fall method. It can be used when there are no inter sights. Back sight (1) Inter sight (2) Fore sight (3 ... The sytle sheet allows you to choose from a set of simple block definitions to be used for the points. It also provides an option to split the data into layers based on the point codes. The style sheet will also carry out some simple feature code processing as it creates the DXF file to join up points based on their codes. (3) When prolonging a line with an electronic theodolite, the instrument operator should either turn a 180-degree angle or plunge the telescope and turn the horizontal tangent so that the horizontal circle reading is the same as it was before plunging the telescope.

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Take levels and book them in a survey record book. Place temporary and permanent bench marks. Take chainages along canals. Reduce and compute levels using both height of collimation and Rise and Fall methods. Take flying back levels for survey checks. Take levels along canal beds and embankments. Take levels and chainages along drainage and ... Book these values and calculate the apparent height difference • compare the two height differences; if the instrument is in adjustment (i.e. its collimation is true) they will be within 5 mm. Figure 2 A method for checking the level accuracy If the instrument's collimation appears to be out, recheck by repeating the process. Then, whilst