The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtEvert Duyckinck, 1814 - 508 σελίδες |
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Σελίδα 152
... sights , which are screwed to the index , and stand perpendicular thereto in each sight is a large and a small aper- ture , or slit , one over the other ; but these are changed , that is , if the large aperture be uppermost in the one sight ...
... sights , which are screwed to the index , and stand perpendicular thereto in each sight is a large and a small aper- ture , or slit , one over the other ; but these are changed , that is , if the large aperture be uppermost in the one sight ...
Σελίδα 153
... sight ; the degrees then cut by the south end of the needle , will give the number to be placed in the second column of your field - book in a line with station No. 1 , and ex- presses the number of degrees the stationary line is from ...
... sight ; the degrees then cut by the south end of the needle , will give the number to be placed in the second column of your field - book in a line with station No. 1 , and ex- presses the number of degrees the stationary line is from ...
Σελίδα 154
... sights directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book , in the second column opposite to station No. 2 ; then measure the ...
... sights directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book , in the second column opposite to station No. 2 ; then measure the ...
Σελίδα 155
... sights . But the generality of mearsmen frequently set themselves in disadvantageous places , so as often to occasion two or more stations to be made , where one may do , which creates much trouble and loss of time ; we will therefore ...
... sights . But the generality of mearsmen frequently set themselves in disadvantageous places , so as often to occasion two or more stations to be made , where one may do , which creates much trouble and loss of time ; we will therefore ...
Σελίδα 156
... sights , because of overseeing the chain- ing ; for should he take back - sights , he must be obliged , after taking his degree , to go back to the foregoing station , to oversee the chaining , and by this means to walk three times over ...
... sights , because of overseeing the chain- ing ; for should he take back - sights , he must be obliged , after taking his degree , to go back to the foregoing station , to oversee the chaining , and by this means to walk three times over ...
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acres altitude Answer arch base bearing blank line centre chains and links circle circle of latitude circumferentor Co-sec Co-tang column compasses contained decimal Dep Lat Dep difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures fore four-pole chains geometrical series given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied Natural Co-sines natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole pole star PROB proportion protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect semicircle Sextant side sights square root station stationary distance subtracted survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry vane versed sine vulgar fraction