A Treatise on Practical Surveying: Which is Demonstrated from Its First Principles, Wherein Every Thing that is Useful and Curious in that Art, is Fully Considered and ExplainedF. Lucas, Jun. and Joseph Cushing, 1816 - 472 páginas |
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Página 168
... true , let the measure of the angle CHD be taken by the line oo , with the chain : if this angle corresponds with its containing sides , the length of the line DC is truly obtained , and the whole work is truly taken . Note . That in ...
... true , let the measure of the angle CHD be taken by the line oo , with the chain : if this angle corresponds with its containing sides , the length of the line DC is truly obtained , and the whole work is truly taken . Note . That in ...
Página 186
... true ; if not , turn the table about , the index lying on the last line , till through the sights you see the object in the first station ; and then screw it fast , and keeping the edge of the index to the second station , direct your ...
... true ; if not , turn the table about , the index lying on the last line , till through the sights you see the object in the first station ; and then screw it fast , and keeping the edge of the index to the second station , direct your ...
Página 224
... true place of the extended line . Lay then the fiducial edge of the scale from 6 to D , and take a distance from C , that will just touch the edge of the scale ; carry that dis- tance along the edge , till the point which was in C ...
... true place of the extended line . Lay then the fiducial edge of the scale from 6 to D , and take a distance from C , that will just touch the edge of the scale ; carry that dis- tance along the edge , till the point which was in C ...
Página 226
... true content of a survey , though it be taken by a chain that is too long or too short . Let the map be constructed , and its area found as if the chain were of the true length , And it will be As the square of the true chain Is the ...
... true content of a survey , though it be taken by a chain that is too long or too short . Let the map be constructed , and its area found as if the chain were of the true length , And it will be As the square of the true chain Is the ...
Página 227
... true content . As the square of 42F . OIn . the square of 504 inches = 254016 Is to the content of the map 920A . IR . 20P . = 147260P . :: The square of 42F . inches = 250749 3In . the square of 507 A R. P. To the true content , = 931 ...
... true content . As the square of 42F . OIn . the square of 504 inches = 254016 Is to the content of the map 920A . IR . 20P . = 147260P . :: The square of 42F . inches = 250749 3In . the square of 507 A R. P. To the true content , = 931 ...
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A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Sin vista previa disponible - 2021 |
Términos y frases comunes
20 perches 50 Dist ABCD acres altitude annexed Answer base bearing bisect blank line centre chains and links chord circle circumferentor Co-secant Secant Co-sine Co-tang column contained cyphers decimal decimal fraction Dep Lat difference divided divisor draw east edge EXAMPLE feet field-book figures four-pole chains given angle half the sum height Hence hypothenuse inches instrument latitude length logarithm magnetical measure meridian distance multiplied needle number of degrees object off-sets parallel parallelogram perpendicular piece of ground plane Portmarnock PROB proportion protractor quotient radius right angles right line scale of equal SCHOLIUM sect semicircle side sights sine square root stationary distance sun's suppose survey taken tance Tang tangent thence theo theodolite THEOREM thro trapezium triangle ABC trigonometry true amplitude true azimuth two-pole chains vane variation whence