Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
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Page 94
... distance be- tween the meridians passing through the extremities of a course , is called the de- parture of that course , and is east or west , according as the course lies on the east or west side of the meridian passing through the ...
... distance be- tween the meridians passing through the extremities of a course , is called the de- parture of that course , and is east or west , according as the course lies on the east or west side of the meridian passing through the ...
Page 95
... meridian distance of a point is the perpendicular let fall on the meridian , from which the distance is estimated This meridian is called the assumed meridian . Thus , if the distance be estimated from NS , BC will be the meridian ...
... meridian distance of a point is the perpendicular let fall on the meridian , from which the distance is estimated This meridian is called the assumed meridian . Thus , if the distance be estimated from NS , BC will be the meridian ...
Page 98
... meridian , and NAB the bearing of AB . Then will AC be the difference of ... distance is less than 50 , it will be found in the column " dis- tance ... distance is greater than 100 , it may be divided by any number which will give an ...
... meridian , and NAB the bearing of AB . Then will AC be the difference of ... distance is less than 50 , it will be found in the column " dis- tance ... distance is greater than 100 , it may be divided by any number which will give an ...
Page 102
C. Davies. Of the double meridian distances of the courses . 141. After the work has been balanced , the next thing to be done is to calculate the double meridian distance of each course . For this purpose , a meridian line is assumed ...
C. Davies. Of the double meridian distances of the courses . 141. After the work has been balanced , the next thing to be done is to calculate the double meridian distance of each course . For this purpose , a meridian line is assumed ...
Page 103
... meridian distance of the last course should be equal to the departure of that course . A verifi- cation of the work is , therefore , obtained by comparing this double meridian distance with the departure of the course . 142. To apply ...
... meridian distance of the last course should be equal to the departure of that course . A verifi- cation of the work is , therefore , obtained by comparing this double meridian distance with the departure of the course . 142. To apply ...
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