Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
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Page 51
... directions of the bounding lines ; and 2d . The accurate delineation of the whole on paper . 69. The earth being spherical , its surface is curved , and every line traced on its surface is also curved . If large portions of the surface ...
... directions of the bounding lines ; and 2d . The accurate delineation of the whole on paper . 69. The earth being spherical , its surface is curved , and every line traced on its surface is also curved . If large portions of the surface ...
Page 55
... direction towards C. Then slide up the chain on the staff at A until it becomes horizontal , and note the distance ab . Then remove the staves and place them at b and d : make the chain horizontal , and note the distance cd . ' Mea ...
... direction towards C. Then slide up the chain on the staff at A until it becomes horizontal , and note the distance ab . Then remove the staves and place them at b and d : make the chain horizontal , and note the distance cd . ' Mea ...
Page 60
... direction to the axis of the theo- dolite , the bubbles will retain the middle places in the tubes , during an entire revolution of the vernier plate , or of the limb and vernier plate together . But the levels of the vernier plate may ...
... direction to the axis of the theo- dolite , the bubbles will retain the middle places in the tubes , during an entire revolution of the vernier plate , or of the limb and vernier plate together . But the levels of the vernier plate may ...
Page 64
... direction between the lines which subtend the angle to be measured , turn the limb with the outer spindle , until the telescope points to the object on the left , very nearly . Clamp the limb with the clamp - screw K , and by means of ...
... direction between the lines which subtend the angle to be measured , turn the limb with the outer spindle , until the telescope points to the object on the left , very nearly . Clamp the limb with the clamp - screw K , and by means of ...
Page 65
... direction . For the minutes , we pass along the ver- nier in the direction in which the degrees are counted , and if we reach the extreme line , which is the fifteenth , without finding a coincidence , we must then pass to the other ...
... direction . For the minutes , we pass along the ver- nier in the direction in which the degrees are counted , and if we reach the extreme line , which is the fifteenth , without finding a coincidence , we must then pass to the other ...
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