The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtEvert Duyckinck, 1814 - 508 σελίδες |
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Σελίδα 38
... angle , as ABC . Note , When an angle is expressed by three let- ters , the middle one is that at the angular point . 9. When the lines that form the angle are right ones , it is then called a right - lined angle , as ABC , fig . 4. If ...
... angle , as ABC . Note , When an angle is expressed by three let- ters , the middle one is that at the angular point . 9. When the lines that form the angle are right ones , it is then called a right - lined angle , as ABC , fig . 4. If ...
Σελίδα 41
... angle , is the arc of a circle swept from the angular point , and G contained between the two lines that form the angle thus GEOMETRY . 41.
... angle , is the arc of a circle swept from the angular point , and G contained between the two lines that form the angle thus GEOMETRY . 41.
Σελίδα 42
... angle thus the angle HCB ( fig . 8. ) is measur- ed by the arc HB , and is said to contain so many degrees as the arc HB does ; so if the arc HB is 60 degrees , the angle HCB is an angle of 60 degrees . Hence angles are greater or less ...
... angle thus the angle HCB ( fig . 8. ) is measur- ed by the arc HB , and is said to contain so many degrees as the arc HB does ; so if the arc HB is 60 degrees , the angle HCB is an angle of 60 degrees . Hence angles are greater or less ...
Σελίδα 43
... angles , it is either right- angled , having one right angle , as D. fig . 13 . 37. Or obtuse angled , having one obtuse angle , as E. fig . 14 . 38. Or acute angled , having all the angles acute , as F. fig . 15 . 39. Acute and obtuse ...
... angles , it is either right- angled , having one right angle , as D. fig . 13 . 37. Or obtuse angled , having one obtuse angle , as E. fig . 14 . 38. Or acute angled , having all the angles acute , as F. fig . 15 . 39. Acute and obtuse ...
Σελίδα 47
... angles , or two angles equal to two right angles . 1. If AB be perpendicular to CD , then ( by def . 10. ) the angles CBA , and ABD , will be each a right angle . 2. But if EB fall slantwise on CD , then are the angles DBE + EBC = DBE + ...
... angles , or two angles equal to two right angles . 1. If AB be perpendicular to CD , then ( by def . 10. ) the angles CBA , and ABD , will be each a right angle . 2. But if EB fall slantwise on CD , then are the angles DBE + EBC = DBE + ...
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acres altitude Answer arch base bearing blank line centre chains and links circle circle of latitude circumferentor Co-sec Co-tang column compasses contained decimal Dep Lat Dep difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures fore four-pole chains geometrical series given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied Natural Co-sines natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole pole star PROB proportion protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect semicircle Sextant side sights square root station stationary distance subtracted survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry vane versed sine vulgar fraction