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 páginas |
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Página 95
... complement of that arch , and its dif- ference from 180 ° , or a semi - circle , is called its sup- plement . 5. A Chord , or Subtence of an arch , is a right line joining its extremeties . 6. The Sine of an arch , is a right SECT . II .
... complement of that arch , and its dif- ference from 180 ° , or a semi - circle , is called its sup- plement . 5. A Chord , or Subtence of an arch , is a right line joining its extremeties . 6. The Sine of an arch , is a right SECT . II .
Página 102
... sect . 1. ) as CAB ; lay 250 , which is the given hy- pothenuse , from a scale of equal parts , from A to C ; from C , let fall the perpendicular BC ( by prob . 7. sect . 1. ) and that will constitute the triangle ABC . Measure the ...
... sect . 1. ) as CAB ; lay 250 , which is the given hy- pothenuse , from a scale of equal parts , from A to C ; from C , let fall the perpendicular BC ( by prob . 7. sect . 1. ) and that will constitute the triangle ABC . Measure the ...
Página 104
... sect . 1 . By Gunter's Scale . On this scale there are lines of numbers , sines , and tangents , as well as lines of sine and tangent rumbs , versed sines , meridional parts , and equal parts ; but the three first lines are sufficient ...
... sect . 1 . By Gunter's Scale . On this scale there are lines of numbers , sines , and tangents , as well as lines of sine and tangent rumbs , versed sines , meridional parts , and equal parts ; but the three first lines are sufficient ...
Página 105
... sect . 1. The sine of 90 ° is equal to the radius ; and the tangent of 45o is also equal to the radius ; because if one angle of a right - angled triangle be 45 ° , the other will be also 45 ° ; and thence ( by the lemma preceding theo ...
... sect . 1. The sine of 90 ° is equal to the radius ; and the tangent of 45o is also equal to the radius ; because if one angle of a right - angled triangle be 45 ° , the other will be also 45 ° ; and thence ( by the lemma preceding theo ...
Página 106
... sect . 1. ) in blank lines , as before . From a scale of equal parts , lay 190 from A to B ; on the point B , erect a perpendicular BC ( by prob . 5. sect . 1. ) the point where this cuts the other blank line of the angle , will be C ...
... sect . 1. ) in blank lines , as before . From a scale of equal parts , lay 190 from A to B ; on the point B , erect a perpendicular BC ( by prob . 5. sect . 1. ) the point where this cuts the other blank line of the angle , will be C ...
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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 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