Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
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Page 56
... plate FG . A hollow conic spindle passes through the middle of the ball , and the hollow frustrum with which it is ... vernier plate , which rests on the limb of the instrument , and supports the upper frame - work . The two spindles ...
... plate FG . A hollow conic spindle passes through the middle of the ball , and the hollow frustrum with which it is ... vernier plate , which rests on the limb of the instrument , and supports the upper frame - work . The two spindles ...
Page 57
... vernier plate , that is concentric with it , the use of which will be explained under the head compass . The frame - work which supports the horizontal axis of the vertical semicircle UV and the upper telescope , with its attached level ...
... vernier plate , that is concentric with it , the use of which will be explained under the head compass . The frame - work which supports the horizontal axis of the vertical semicircle UV and the upper telescope , with its attached level ...
Page 58
... vernier plate , and direct the telescope to a small , well- defined , and distant object . By means of a small pin i , on the under side of the telescope , slide the eyeglass till the spider's lines are seen distinctly ; then with the ...
... vernier plate , and direct the telescope to a small , well- defined , and distant object . By means of a small pin i , on the under side of the telescope , slide the eyeglass till the spider's lines are seen distinctly ; then with the ...
Page 59
... vernier plate , till the telescope comes directly over two of the levelling screws , between the plates DE and FG . Turn these screws contrary ways , keeping them firm against the plate FG , till the bubble of the level mn , stands at ...
... vernier plate , till the telescope comes directly over two of the levelling screws , between the plates DE and FG . Turn these screws contrary ways , keeping them firm against the plate FG , till the bubble of the level mn , stands at ...
Page 60
... vernier plate truly vertical . This adjustment is effected , partly by the levelling screws , and partly by the thumb - screw Z. Turn the vernier plate , until the upper telescope comes directly over two of the level- ling screws , then ...
... vernier plate truly vertical . This adjustment is effected , partly by the levelling screws , and partly by the thumb - screw Z. Turn the vernier plate , until the upper telescope comes directly over two of the level- ling screws , then ...
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