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 |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 24.
Σελίδα 125
... sight , fall upon the hole in the lower one ; and the de- gree then cut by the thread , will be the angle of the sun's altitude ; but those sights are useless for our present purpose , for looking along the quadrant's edge to the top of ...
... sight , fall upon the hole in the lower one ; and the de- gree then cut by the thread , will be the angle of the sun's altitude ; but those sights are useless for our present purpose , for looking along the quadrant's edge to the top of ...
Σελίδα 167
... sights , which are screwed to the index , and stand perpendicular thereto : in each sight is a large and small aperture 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 small aperture or slit , one over the other ; but these are changed , that is , if the large aperture be uppermost in the one sight ...
Σελίδα 168
... sight : the de- grees 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 expresses the number of degress the stationary line is from ...
... sight : the de- grees 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 expresses the number of degress the stationary line is from ...
Σελίδα 169
... 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 170
... sights , thus : let your object stand at the point where you begin your survey , as at A ; leaving him there , proceed to your next angle B , where fix your instrument so that you may have the longest view possible towards C. Having set ...
... sights , thus : let your object stand at the point where you begin your survey , as at A ; leaving him there , proceed to your next angle B , where fix your instrument so that you may have the longest view possible towards C. Having set ...
Άλλες εκδόσεις - Προβολή όλων
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