Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 61
... theodolite , the positions of which are determined with great care by the maker , and fixed permanently . First , the axis of the instrument is placed exactly at right angles with the limb and vernier plate ; and unless it have this ...
... theodolite , the positions of which are determined with great care by the maker , and fixed permanently . First , the axis of the instrument is placed exactly at right angles with the limb and vernier plate ; and unless it have this ...
Page 62
... theodolite be so constructed that either of the Y's admits of being moved laterally , so as to vary the angle be- tween the horizontal axis and the line of collimation , these lines may be adjusted at right angles to each other , if ...
... theodolite be so constructed that either of the Y's admits of being moved laterally , so as to vary the angle be- tween the horizontal axis and the line of collimation , these lines may be adjusted at right angles to each other , if ...
Page 63
... theodolite , m = 29 , a = 30 ′ and n = 30 hence ; x 29 × 30 ′ 30 = 29 ' ; and a - x = 30 ' - 29 ' = 1 ' , the excess of a space on the limb over a space on the vernier . Fig . 2. Let AB be a portion of the limb of the instru- ment , and ...
... theodolite , m = 29 , a = 30 ′ and n = 30 hence ; x 29 × 30 ′ 30 = 29 ' ; and a - x = 30 ' - 29 ' = 1 ' , the excess of a space on the limb over a space on the vernier . Fig . 2. Let AB be a portion of the limb of the instru- ment , and ...
Page 64
... theodolite . Place the axis of the instrument directly over the point at which the angle is to be measured . This is effected by means of a plumb , suspended from the plate which forms the upper end of the tripod . Having made the limb ...
... theodolite . Place the axis of the instrument directly over the point at which the angle is to be measured . This is effected by means of a plumb , suspended from the plate which forms the upper end of the tripod . Having made the limb ...
Page 65
... is to ascertain the point of the vertical limb at which the 0 point of the vernier stands , when the line of collimation of the upper telescope , together with its attached level , is truly horizontal . This is 6 * OF THE THEODOLITE . 65.
... is to ascertain the point of the vertical limb at which the 0 point of the vernier stands , when the line of collimation of the upper telescope , together with its attached level , is truly horizontal . This is 6 * OF THE THEODOLITE . 65.
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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 decimal DegDeg Distance 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 LatDegDeg LatDegDegDegDeg Distance latitude and departure length levelling screws line AC line of collimation logarithm marked measure multiplied natural sines paper parallel passing perpendicular plane of reference protractor radius right angles rods scale of equal secant side sights similar triangles Sine D Sine Sine spider's lines square chains staff subtract surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards