Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
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Page 17
... object the measurement of extension . Extension has three dimensions , length , breadth , height , or thickness . 2 A line is lengh without breadth , or thickness . The extremities of a line are called points : a point , there- fore ...
... object the measurement of extension . Extension has three dimensions , length , breadth , height , or thickness . 2 A line is lengh without breadth , or thickness . The extremities of a line are called points : a point , there- fore ...
Page 52
... objects which subtend the angle . 76. A vertical angle is one , the plane of whose sides is vertical . 77. An angle of ... object of measurement . must belong to one of the classes above named , viz . : 1st . Horizontal lines : 2d ...
... objects which subtend the angle . 76. A vertical angle is one , the plane of whose sides is vertical . 77. An angle of ... object of measurement . must belong to one of the classes above named , viz . : 1st . Horizontal lines : 2d ...
Page 57
... object to which the upper telescope is directed , above or below the place of the instrument , in 100th parts of the horizontal distance the other , the difference between the hypothenusal and base lines : the hypothenuse being supposed ...
... object to which the upper telescope is directed , above or below the place of the instrument , in 100th parts of the horizontal distance the other , the difference between the hypothenusal and base lines : the hypothenuse being supposed ...
Page 58
... object glass . In order that the axis of the telescope may be directed to an object with precision , two spider's lines , or small hairs , are fixed at right angles to each other , and placed within the barrel of the telescope , and at ...
... object glass . In order that the axis of the telescope may be directed to an object with precision , two spider's lines , or small hairs , are fixed at right angles to each other , and placed within the barrel of the telescope , and at ...
Page 61
... object , and move the telescope with the thumb - screw Z : if the intersection of the spider's lines continue on the vertical line , the axis is horizontal . Or , the adjustment may be effected thus : Direct the inter- section of the ...
... object , and move the telescope with the thumb - screw Z : if the intersection of the spider's lines continue on the vertical line , the axis is horizontal . Or , the adjustment may be effected thus : Direct the inter- section of the ...
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