Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 70
... angles of elevation at A and B. Then , since the outward angle DBC is equal to the sum of the angles A and ADB , it follows , that the angle ADB is equal to the difference of the angles of elevation at A and B. Hence , we can find all ...
... angles of elevation at A and B. Then , since the outward angle DBC is equal to the sum of the angles A and ADB , it follows , that the angle ADB is equal to the difference of the angles of elevation at A and B. Hence , we can find all ...
Page 73
... angle of elevation of the top of the hill 40 ° , and of the top of the tower 51 ° ; then mea- suring in a direct line 180 feet farther from the hill , the angle of elevation of the top of the tower was 33 ° 45 ' ; required the height of ...
... angle of elevation of the top of the hill 40 ° , and of the top of the tower 51 ° ; then mea- suring in a direct line 180 feet farther from the hill , the angle of elevation of the top of the tower was 33 ° 45 ' ; required the height of ...
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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