Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 18
... intersection A is the vertex of the angle , and the lines AB , A4 AC , are its sides . C -B The angle is sometimes designed simply by the letter at the vertex A ; sometimes by the three letters BAC , or CAB , the letter at the vertex ...
... intersection A is the vertex of the angle , and the lines AB , A4 AC , are its sides . C -B The angle is sometimes designed simply by the letter at the vertex A ; sometimes by the three letters BAC , or CAB , the letter at the vertex ...
Page 58
... intersection of the spider's lines , ought to coincide . FIRST ADJUSTMENT . The first adjustment regards the line of collimation : it is , to fix the intersection of the spider's lines in the axis of the telescope . Having screwed the ...
... intersection of the spider's lines , ought to coincide . FIRST ADJUSTMENT . The first adjustment regards the line of collimation : it is , to fix the intersection of the spider's lines in the axis of the telescope . Having screwed the ...
Page 61
... intersection of the spider's lines continue on the vertical line , the axis is horizontal . Or , the adjustment may ... intersection of the spider's lines to a well - defined point ; then removing the caps which con- fine the ...
... intersection of the spider's lines continue on the vertical line , the axis is horizontal . Or , the adjustment may ... intersection of the spider's lines to a well - defined point ; then removing the caps which con- fine the ...
Page 62
... intersection of a vertical plane passed through the line of collimation , with the vernier plate . It is important to ascertain the exact arc intercepted on the limb , between its 0 point , ( this being the point from which the degrees ...
... intersection of a vertical plane passed through the line of collimation , with the vernier plate . It is important to ascertain the exact arc intercepted on the limb , between its 0 point , ( this being the point from which the degrees ...
Page 64
... intersection of the spider's lines to coincide exactly with the object . Having loosened the clamp - screw Q of the lower telescope MN , direct it with the thumb - screw P to the same object at which the upper telescope is directed ...
... intersection of the spider's lines to coincide exactly with the object . Having loosened the clamp - screw Q of the lower telescope MN , direct it with the thumb - screw P to the same object at which the upper telescope is directed ...
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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