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 133
... Ст B To take the altitude of a perpendicular object , on the top of a hill , at one station ; when the top and bottom of it can be seen from the foot of the hill . As in prob . 1. take an angle to the. OF HEIGHTS . 133 fig. 81. ...
... Ст B To take the altitude of a perpendicular object , on the top of a hill , at one station ; when the top and bottom of it can be seen from the foot of the hill . As in prob . 1. take an angle to the. OF HEIGHTS . 133 fig. 81. ...
Σελίδα 135
... stations , thus ; Let DC be a tower which cannot be approached , by means of a moat or ditch , nearer than B ; at B , take an angle of altitude to C ; measure any convenient dis- tance backward to A , which note down : at A , take ...
... stations , thus ; Let DC be a tower which cannot be approached , by means of a moat or ditch , nearer than B ; at B , take an angle of altitude to C ; measure any convenient dis- tance backward to A , which note down : at A , take ...
Σελίδα 138
... thereof , take another angle to the top ; and you have the proper requisites , thus ; First station . Angle to the foot DAB 21 °. This is done at two stations , thus ;. 138 OF HEIGHTS . This is done at two stations, thus; ...
... thereof , take another angle to the top ; and you have the proper requisites , thus ; First station . Angle to the foot DAB 21 °. This is done at two stations , thus ;. 138 OF HEIGHTS . This is done at two stations, thus; ...
Σελίδα 140
... stations . Make a station at B , from whence take an angle to the foot , and another to the top of the tree ; measure any convenient distance backward to A , from whence also Jet an angle be taken to the foot and another to the top ...
... stations . Make a station at B , from whence take an angle to the foot , and another to the top of the tree ; measure any convenient distance backward to A , from whence also Jet an angle be taken to the foot and another to the top ...
Σελίδα 164
... station No , 1 ; and in the same line under the title of distances , in ' the third column , let the measure of the line AB in chains and links be inserted . Being now arrived at B , let one chain be laid in a direct line from B towards ...
... station No , 1 ; and in the same line under the title of distances , in ' the third column , let the measure of the line AB in chains and links be inserted . Being now arrived at B , let one chain be laid in a direct line from B towards ...
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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