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 31
... circle ; and the curve line described by the point B , is called the cir- cumference , or the periphery of the circle ; the fixed point C is called its centre . fig . 8 . D 1K F B E 15. The describing line CB . is called the semidiame ...
... circle ; and the curve line described by the point B , is called the cir- cumference , or the periphery of the circle ; the fixed point C is called its centre . fig . 8 . D 1K F B E 15. The describing line CB . is called the semidiame ...
Σελίδα 35
... circle may be described . 4. It is also required that the equality of lines and angles to others given , be granted as possible : that it is possibly for one right line to be perpendicular to an- other , at a given point or distance ...
... circle may be described . 4. It is also required that the equality of lines and angles to others given , be granted as possible : that it is possibly for one right line to be perpendicular to an- other , at a given point or distance ...
Σελίδα 43
... circle ABED is double the angle BAD at the circumference , stand- ing upon the same arc BED . fig . 25 . B Through the point A , and the centre C , draw the line ACE then the angle ECD = CAD + CDA ; ( by theo . 4. ) but since ACCD being ...
... circle ABED is double the angle BAD at the circumference , stand- ing upon the same arc BED . fig . 25 . B Through the point A , and the centre C , draw the line ACE then the angle ECD = CAD + CDA ; ( by theo . 4. ) but since ACCD being ...
Σελίδα 44
... circle which stand on the same chord as AB , are equal to each other , for they are all measured by half the arc they stand on , viz . by half the arc AB . fig . 26 . 1 A fig . 26 . Cor . 3. Hence an angle in a segment greater than a ...
... circle which stand on the same chord as AB , are equal to each other , for they are all measured by half the arc they stand on , viz . by half the arc AB . fig . 26 . 1 A fig . 26 . Cor . 3. Hence an angle in a segment greater than a ...
Σελίδα 45
... circle ABE , there be let fall the perpen- dicular CD on the chord AB , it will bisect it in the point D. fig . 29 . fig . 29 . E C A B Let the lines CA and CB be drawn from the centre to the extremities of the chord , then since CA ...
... circle ABE , there be let fall the perpen- dicular CD on the chord AB , it will bisect it in the point D. fig . 29 . fig . 29 . E C A B Let the lines CA and CB be drawn from the centre to the extremities of the chord , then since CA ...
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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