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 132
... Turn the centre A of the quadrant , next your eye , and look along the side AC , or 90 side , to the top and bottom of the object ; and noting down the angles , mea- sure the distance from the place of observation to the foot of the ...
... Turn the centre A of the quadrant , next your eye , and look along the side AC , or 90 side , to the top and bottom of the object ; and noting down the angles , mea- sure the distance from the place of observation to the foot of the ...
Página 170
... turn the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E D , and pulling each part straight , OF THE CIRCUMFERENTOR . THIS instrument is composed of a 170 OF THE CHAIN .
... turn the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E D , and pulling each part straight , OF THE CIRCUMFERENTOR . THIS instrument is composed of a 170 OF THE CHAIN .
Página 172
... turning the box so , that the ends of the needle may be equidistant from its bottom , and it traverses or plays freely ) turn the flower - de luce or north part of the box to your eye , and looking through the small aperture , turn the ...
... turning the box so , that the ends of the needle may be equidistant from its bottom , and it traverses or plays freely ) turn the flower - de luce or north part of the box to your eye , and looking through the small aperture , turn the ...
Página 174
... turn the south part of the box next your eye , and having cut your object at A , reckon the degrees to the south point of the needle , which will be the same as if they were taken from the object to the instrument , the direction of the ...
... turn the south part of the box next your eye , and having cut your object at A , reckon the degrees to the south point of the needle , which will be the same as if they were taken from the object to the instrument , the direction of the ...
Página 176
... turn the north part of the box to your eye , and count your degrees to the south part of the needle , as before ; or you may turn the south of the box to your eye , and count your degrees to the north end of the needie . But in back ...
... turn the north part of the box to your eye , and count your degrees to the south part of the needle , as before ; or you may turn the south of the box to your eye , and count your degrees to the north end of the needie . But in back ...
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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