By J. Uren, W. F. Price (auth.)
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Sample text
Each list provides information on bench marks in a one kilometre square and carries the same National Grid reference number as the corresponding 1:2500 scale map. The locations and heights of bench marks are also marked on 1: 1250 and 1:2500 scale maps. 10 Aims and Limitations of this Book Engineers use land surveying simply as one of the means by which they can undertake their work and there is a definite limit to the surveying knowledge required by them, beyond which the surveying becomes of interest rather than importance.
This is usually achieved by using a three footscrew arrangement in conjunction with a small circular level (sometimes called a pond bubble) which is mounted somewhere on the level. 10, which has been exaggerated for clarity. ) 38 SURVEYING FOR ENGINEERS .. horizontal cross hair telescope tilted upwards horizontal lineof sight- telescope horizontal ... 10 Action of compensator telescope tube when the instrument has been levelled and which takes up a position according to the angle of tilt of the telescope.
As before, the test should be repeated at this stage to ensure that the test has been carried out correctly. 219 m Calculate (1) The collimation error of the level per 50 m of sight (2) The reading that should have been observed on the staff at A from the level in position 5 m from B. 19 for S I tO S4 is adhered tO. If it is not, incorrect answers will be obtained. 12 The Levelling Staff The levelling staff enables distances to be measured vertically above or below points on which it is held relative to a line of collimation.
