Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 128
... elongation . The following tables show the times of its greatest eastern and western elongations . EASTERN ELONGATIONS . Days April May June July August Sept H. M. H. M. H. M. H. M. H. M. H. M. 1 18 18 16 26 14 24 12 20 10 16 8 20 my 17 ...
... elongation . The following tables show the times of its greatest eastern and western elongations . EASTERN ELONGATIONS . Days April May June July August Sept H. M. H. M. H. M. H. M. H. M. H. M. 1 18 18 16 26 14 24 12 20 10 16 8 20 my 17 ...
Page 129
... elongation , and the observation be made at night , when the star is on the meridian . The following table exhibits the angle which the meridian plane makes with the vertical plane passing through the pole- star , when at its greatest ...
... elongation , and the observation be made at night , when the star is on the meridian . The following table exhibits the angle which the meridian plane makes with the vertical plane passing through the pole- star , when at its greatest ...
Page 130
... elongation of the pole - star , as shown by the tables of elongations , let the theodolite be placed at a con ... elongation that is to be observed , and the star has not yet reached the most easterly point , it will move from the ...
... elongation of the pole - star , as shown by the tables of elongations , let the theodolite be placed at a con ... elongation that is to be observed , and the star has not yet reached the most easterly point , it will move from the ...
Page 131
... elongation were west , the true meridian lies on the east of the line : and , in either case , laying off the azimuth angle with the theodolite , gives the true meridian . To find the true meridian with the compass . 158. 1. Drive two ...
... elongation were west , the true meridian lies on the east of the line : and , in either case , laying off the azimuth angle with the theodolite , gives the true meridian . To find the true meridian with the compass . 158. 1. Drive two ...
Page 132
... elongation being west , the difference between the azimuth and the angle would show the variation and the reverse when the elongation is east . 1. Elongation west , azimuth North end of the needle on the west , angle 2. Elongation west ...
... elongation being west , the difference between the azimuth and the angle would show the variation and the reverse when the elongation is east . 1. Elongation west , azimuth North end of the needle on the west , angle 2. Elongation west ...
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Common terms and phrases
adjusted angle of elevation axis azimuth back-sights base line called centre clamp-screw coincide column comp compass Cosine D Cosine Sine Cotang course curve degrees determined difference of level direction divided double meridian distance draw east elongation error example feet field notes figure given angle given line given point ground Gunter's chain hence horizontal angle horizontal distance horizontal plane hypothenuse inches instrument intersection LatDegDegDegDeg Distance latitude and departure length levelling screws line AC line of collimation logarithm M.
M. Sine marked measure method multiplied natural sines needle object paper parallel passing perpendicular plane of reference protractor radius right angles right-angled triangle rods scale of equal secant side sights similar triangles Sine Sine spider's lines square chains staff subtract surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards