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 páginas |
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Página 27
... centre . fig . 8 . D F B E 45. The describing line CB . is called the semi- diameter , or radius , or any line from the centre to the circumference ; whence all radii of the same , or of equal circles are equal . 16 . The diameter of a ...
... centre . fig . 8 . D F B E 45. The describing line CB . is called the semi- diameter , or radius , or any line from the centre to the circumference ; whence all radii of the same , or of equal circles are equal . 16 . The diameter of a ...
Página 31
... centre and with any radius , the circumference of a 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 possible for one right line to be ...
... centre and with any radius , the circumference of a 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 possible for one right line to be ...
Página 39
... centre of a circle ABED is double the an- gle BAD at the circumference , standing upon the same arc LED fig . 25 . 72 fg . 25 . BK Through the point A , and the centre C , draw the line ACE : then the angle ECD = CAD + CDA ; ( by theo ...
... centre of a circle ABED is double the an- gle BAD at the circumference , standing upon the same arc LED fig . 25 . 72 fg . 25 . BK Through the point A , and the centre C , draw the line ACE : then the angle ECD = CAD + CDA ; ( by theo ...
Página 41
... centre to the extremities of the chord , then since CA = CB , the angle CAB = CBA ( by the lemma . ) But the tri ... centre perpendicular to a chord , bisects that chord at right angles ; therefore , conversely , a line bi- secting a ...
... centre to the extremities of the chord , then since CA = CB , the angle CAB = CBA ( by the lemma . ) But the tri ... centre perpendicular to a chord , bisects that chord at right angles ; therefore , conversely , a line bi- secting a ...
Página 42
... centre of a circle ABE there be drawn a perpendicular CD on the chord AB , and produced till it meets the circle in F , that line CF , will bisect the arc AB in the point F. fig . 29 . Let the lines AF and BF be drawn , then in the tri ...
... centre of a circle ABE there be drawn a perpendicular CD on the chord AB , and produced till it meets the circle in F , that line CF , will bisect the arc AB in the point F. fig . 29 . Let the lines AF and BF be drawn , then in the tri ...
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A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Sin vista previa disponible - 2021 |
Términos y frases comunes
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