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 σελίδες |
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Σελίδα 129
... sight , fall upon the hole in the lower one ; and the degree then cut by the thread , will be the angle of the sun's alti- tude ; but those sights are useless for our present pur- pose , for looking along the quadrant's edge to the top ...
... sight , fall upon the hole in the lower one ; and the degree then cut by the thread , will be the angle of the sun's alti- tude ; but those sights are useless for our present pur- pose , for looking along the quadrant's edge to the top ...
Σελίδα 171
... sights , which are screwed to the index , and stand perpendicular thereto in each sight is a large and a 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 a 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 172
... 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 degrees the stationary Ine 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 degrees the stationary Ine is from ...
Σελίδα 173
... 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 174
... 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 pos- ble 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 pos- ble towards C. Having set ...
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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 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