A TREATISE ON THE PRINCIPLES AND PRACTICE OF LEVELLING |
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Page 147
... point between B and C. Then pro- duce the straight lines A B and CD until they intersect in the point F , and on these lines drive in stakes at equal distances , a1 , a2 , a3 , & c . , commencing from the points B and C. Ifrequal the ...
... point between B and C. Then pro- duce the straight lines A B and CD until they intersect in the point F , and on these lines drive in stakes at equal distances , a1 , a2 , a3 , & c . , commencing from the points B and C. Ifrequal the ...
Page 152
... point of intersection of the lines A B and CD produced ; then if the former be moved through an arc of any number of degrees , towards F , and the latter the same number of degrees toward B , the point a1 , where the lines of ...
... point of intersection of the lines A B and CD produced ; then if the former be moved through an arc of any number of degrees , towards F , and the latter the same number of degrees toward B , the point a1 , where the lines of ...
Page 156
... point B , lay off this angle 2 ° 17 ′ 6 ′′ from the line B F , and upon the line Ba1 thus obtained set off 100 feet , which will give the first point in the curve a1 ; then with an angle of 4 ° 34 ' 12 " or 2 3 set off another 100 feet from ...
... point B , lay off this angle 2 ° 17 ′ 6 ′′ from the line B F , and upon the line Ba1 thus obtained set off 100 feet , which will give the first point in the curve a1 ; then with an angle of 4 ° 34 ' 12 " or 2 3 set off another 100 feet from ...
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Common terms and phrases
a₁ adjustment assumed datum b₁ back sight back staff back station bench mark Bottom of ditch centre stake chain Civil Engineer clinometer Cloth columns of Rise computed half width construction cross wires curve cuttings and embankments datum line determined diagram difference of level direction distance Dover Castle Dumpy Level earth Edge of ditch engraving error example eye-piece fall field-book Folkstone Foot of bank Fore Sight forward reading forward staff give gradient ground Gunter's chain hinge-joint horizontal line hypothenuse Hypsometry inches inclination inclined plane instrument J. P. WHITNEY John Macneill length levelling staves line A B lines of railway London Bridge measured Merrimack River method middle area mile object glass obtain parallax perpendicular placed Plate practice quantity radius reduced levels represent road side slope spirit-bubble spirit-level staff-holder starting point subtracted superelevation surface line surveyor Tables telescope theodolite tion Top of bank Treatise vertical
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