Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 26
... centre , describe the arc BC . Then A take from the scale the chord of the given angle , say 30 degrees , and with this line as a radius , and B as a centre , describe an arc cutting BC in C. Through A and C draw the line AC , and BAC ...
... centre , describe the arc BC . Then A take from the scale the chord of the given angle , say 30 degrees , and with this line as a radius , and B as a centre , describe an arc cutting BC in C. Through A and C draw the line AC , and BAC ...
Page 27
... centre of the protractor . To lay off an angle with a Protractor . Place the diameter AB on the line , so that the centre shall fall on the angular point . Then count the degrees contained in the given angle from A towards B , or from B ...
... centre of the protractor . To lay off an angle with a Protractor . Place the diameter AB on the line , so that the centre shall fall on the angular point . Then count the degrees contained in the given angle from A towards B , or from B ...
Page 29
... centre , E with any radius , describe the arc IL , terminating in the two sides of the angle . From the point A as a centre , with a dis- tance AE equal to KI , describe the arc ED ; then take the chord LI , with which , from the point ...
... centre , E with any radius , describe the arc IL , terminating in the two sides of the angle . From the point A as a centre , with a dis- tance AE equal to KI , describe the arc ED ; then take the chord LI , with which , from the point ...
Page 30
... centre C draw CD : the angle ACE will be equal to the angle ECB , and the arc AE to the arc EB . PROBLEM V. E Through a given point to draw a parallel to a given line . 31. Let A be the given point , and BC the given line . From A as a ...
... centre C draw CD : the angle ACE will be equal to the angle ECB , and the arc AE to the arc EB . PROBLEM V. E Through a given point to draw a parallel to a given line . 31. Let A be the given point , and BC the given line . From A as a ...
Page 32
... centre , with a radius equal to the second side B , describe an arc from E as a centre , with a radius equal to the third side C , describe another arc intersecting the former in D AH BH CH F ; draw DF and EF , and DEF will be the ...
... centre , with a radius equal to the second side B , describe an arc from E as a centre , with a radius equal to the third side C , describe another arc intersecting the former in D AH BH CH F ; draw DF and EF , and DEF will be the ...
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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