Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
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Page 25
... A 1,0 23. If , with any radius , as AC , we describe the quadrant CD , and then divide it into 90 equal parts , each part is called a degree . Through C , and each point of division , let 3 DESCRIPTION OF INSTRUMENTS . 25.
... A 1,0 23. If , with any radius , as AC , we describe the quadrant CD , and then divide it into 90 equal parts , each part is called a degree . Through C , and each point of division , let 3 DESCRIPTION OF INSTRUMENTS . 25.
Page 26
... radius of the circle from which the chords were obtained , is known ; for , the chord marked 60 is always equal to the radius of the circle . A scale of chords is generally laid down on the scales which belong to cases of mathematical ...
... radius of the circle from which the chords were obtained , is known ; for , the chord marked 60 is always equal to the radius of the circle . A scale of chords is generally laid down on the scales which belong to cases of mathematical ...
Page 29
... radius greater than BA , describe two arcs intersecting each other in D : draw AD , and it will be the perpendicular required . PROBLEM II . A From a given point without a straight line , to let fall a perpen- dicular on the line . 28 ...
... radius greater than BA , describe two arcs intersecting each other in D : draw AD , and it will be the perpendicular required . PROBLEM II . A From a given point without a straight line , to let fall a perpen- dicular on the line . 28 ...
Page 30
... radius two arcs cutting each other in D : through D and the centre C draw CD : the angle ACE will be equal to the ... radius greater than the shortest distance from B F C A to BC , describe the indefinite arc ED : from the point E as a ...
... radius two arcs cutting each other in D : through D and the centre C draw CD : the angle ACE will be equal to the ... radius greater than the shortest distance from B F C A to BC , describe the indefinite arc ED : from the point E as a ...
Page 32
... 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 E F ; draw DF and EF , and DEF will be the triangle PROBLEM X ...
... 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 E F ; draw DF and EF , and DEF will be the triangle PROBLEM X ...
Common terms and phrases
acres 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 decimal 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 half hence horizontal angle horizontal distance horizontal plane hypothenuse inches instrument intersection 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 piece of land pins plane of reference protractor radius right angles right-angled triangle rods scale of equal secant side similar triangles spider's lines square chains staff subtract surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards