Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
From inside the book
Results 1-5 of 17
Page 51
... errors will arise if it be neglected . When the curvature is considered , the method of measure- ment and computation is ... error becomes insensible , if we consider the surface a plane . This method of measurement and computation , is ...
... errors will arise if it be neglected . When the curvature is considered , the method of measure- ment and computation is ... error becomes insensible , if we consider the surface a plane . This method of measurement and computation , is ...
Page 60
... error as before , and repeat the operation until the line of the limb is truly horizontal . Then turn the vernier plate 90o , and level as before . The limb ought now to be truly horizontal ; but lest the first horizontal line may have ...
... error as before , and repeat the operation until the line of the limb is truly horizontal . Then turn the vernier plate 90o , and level as before . The limb ought now to be truly horizontal ; but lest the first horizontal line may have ...
Page 61
... error be divided between the level and the limb ; and repeat the operation until the levels will continue horizontal during an entire revolution : the limb is then horizontal , and the axis of the instrument truly vertical . FOURTH ...
... error be divided between the level and the limb ; and repeat the operation until the levels will continue horizontal during an entire revolution : the limb is then horizontal , and the axis of the instrument truly vertical . FOURTH ...
Page 93
... error will arise in supposing the meridians to be parallel ; and since , in all the surveys made with the compass , the surface of the ground is regarded as a horizontal plane , the meridians are represented by horizontal and parallel ...
... error will arise in supposing the meridians to be parallel ; and since , in all the surveys made with the compass , the surface of the ground is regarded as a horizontal plane , the meridians are represented by horizontal and parallel ...
Page 97
... error . 1st . The inaccuracy of the observations : 2d . Local attractions , or the derangement which the needle experiences when brought into the vicinity of iron - ore beds , or any ferruginous substances . To guard against these ...
... error . 1st . The inaccuracy of the observations : 2d . Local attractions , or the derangement which the needle experiences when brought into the vicinity of iron - ore beds , or any ferruginous substances . To guard against these ...
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