Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 52
... angle is one , the plane of whose sides is vertical . 77. An angle of elevation , is a vertical angle having one of its sides horizontal , and the inclined side above the horizontal side . Thus , in the last figure , BAC is the angle of ...
... angle is one , the plane of whose sides is vertical . 77. An angle of elevation , is a vertical angle having one of its sides horizontal , and the inclined side above the horizontal side . Thus , in the last figure , BAC is the angle of ...
Page 65
... angle , but convenient merely ; for , whatever be the position of this point on the limb , it is evident that the ... elevation being read from the o of the limb towards the right , and those of depression in the contrary direction ...
... angle , but convenient merely ; for , whatever be the position of this point on the limb , it is evident that the ... elevation being read from the o of the limb towards the right , and those of depression in the contrary direction ...
Page 66
... angle of depression . If then we turn the whole 180o , and then raise the depressed end of the telescope with the ... elevation , and added , for angles of depression ; and the reverse when it falls on the other side . The eyeglass ...
... angle of depression . If then we turn the whole 180o , and then raise the depressed end of the telescope with the ... elevation , and added , for angles of depression ; and the reverse when it falls on the other side . The eyeglass ...
Page 68
... angle CBA = 41 ° 24 ′ , the horizontal angle CAB = 96o 28 ' , and the angle of elevation DBC - 10 ° 43 ' .. In the triangle BAC , to find the horizontal distance BC . = The angle BCA 180 ° - ( 41 ° 24 ' + 96 ° 28 ′ ) = 42 ° 08 ′ = C. As ...
... angle CBA = 41 ° 24 ′ , the horizontal angle CAB = 96o 28 ' , and the angle of elevation DBC - 10 ° 43 ' .. In the triangle BAC , to find the horizontal distance BC . = The angle BCA 180 ° - ( 41 ° 24 ' + 96 ° 28 ′ ) = 42 ° 08 ′ = C. As ...
Page 69
... angle of elevation of the point D , we shall know in the right angled DAE , the base AE , and the angle at the base ; from which the perpendicular DE can be determined . Let us suppose that we had measured the angle of elevation DAE ...
... angle of elevation of the point D , we shall know in the right angled DAE , the base AE , and the angle at the base ; from which the perpendicular DE can be determined . Let us suppose that we had measured the angle of elevation DAE ...
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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