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 Cushing & Jewett, J. Robinson printer, 1822 - 326 σελίδες |
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Σελίδα 128
... 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 , measure 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 , measure the distance from the place of observation to the foot of the ...
Σελίδα 166
... turn the chain over to D , so as to complete a parallelogram ; by reckon- ing off the same number of links you had in BC , from E to D , and pulling each part straight . OF THE CIRCUMFERENTOR . THIS instrument is composed of a 166 OF ...
... turn the chain over to D , so as to complete a parallelogram ; by reckon- ing off the same number of links you had in BC , from E to D , and pulling each part straight . OF THE CIRCUMFERENTOR . THIS instrument is composed of a 166 OF ...
Σελίδα 168
... 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 ...
Σελίδα 170
... 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 ...
Σελίδα 172
... 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 needle . 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 needle . But in back ...
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A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2021 |
Συχνά εμφανιζόμενοι όροι και φράσεις
20 perches ABCD acres altitude Answer base bearing blank line centre chains and links chord circle circumferentor Co-secant co-sine Co-tang column compass contained cyphers decimal decimal fraction difference Dist 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 measure meridian distance multiplied needle number of degrees object off-sets opposite parallel parallelogram perpendicular piece of ground plane polygon Portmarnock PROB proportion protractor quotient radius right angles right line scale of equal SCHOLIUM secant second station sect semicircle side sights sine square root stationary distance stationary line sun's suppose survey taken tang tangent thence theo theodolite THEOREM thro triangle ABC trigonometry true amplitude true azimuth two-pole chains vane variation whence