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 σελίδες |
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Σελίδα 29
... opposite sides are parallel , are called parallelograms : thus ABCD is a parallelogram . fig . 3. 17. and fig . 18. 19 . [ see fig . 3 . page 25. ] ن 30. A parallelogram whose sides are all equal and angles GEOMETRY . 29.
... opposite sides are parallel , are called parallelograms : thus ABCD is a parallelogram . fig . 3. 17. and fig . 18. 19 . [ see fig . 3 . page 25. ] ن 30. A parallelogram whose sides are all equal and angles GEOMETRY . 29.
Σελίδα 30
... opposite sides are equal and angles right , is called a rectangle or an oblong , as ABCD , fig . 3 . 32. A rhombus is a parallelogram of equal sides , and has its angles ob- lique , as fig . 18 . 33. A rhomboides is a parallelo- gram ...
... opposite sides are equal and angles right , is called a rectangle or an oblong , as ABCD , fig . 3 . 32. A rhombus is a parallelogram of equal sides , and has its angles ob- lique , as fig . 18 . 33. A rhomboides is a parallelo- gram ...
Σελίδα 35
... opposite angles made by those lines , will be equal to each other ; that is AEB to CED and BEC to AED . fig . 21 . B A 21 . By theorem 1. BEC + CED - 2 right angles . and CED + DEA = 2 right angles . D Therefore ( by axiom 1. ) BEC + ...
... opposite angles made by those lines , will be equal to each other ; that is AEB to CED and BEC to AED . fig . 21 . B A 21 . By theorem 1. BEC + CED - 2 right angles . and CED + DEA = 2 right angles . D Therefore ( by axiom 1. ) BEC + ...
Σελίδα 36
... opposite one on the same side , that is , GEB = EFD and AEG = CFE . 4. And the sum of the internal angles on the same side are equal to two right angles ; that is , BEF + DFE are equal to two right angles ,. and AEF + CFE are equal to ...
... opposite one on the same side , that is , GEB = EFD and AEG = CFE . 4. And the sum of the internal angles on the same side are equal to two right angles ; that is , BEF + DFE are equal to two right angles ,. and AEF + CFE are equal to ...
Σελίδα 37
... opposite angles taken together . Viz . to B and A. fig . 23 . B A fig . 23 . E Ņ Thro ' C , let CE be drawn parallel to AB ; then since BD cuts the two parallel lines BA , CE ; the angle ECD = B ( by part 3. of the last theo . ) and ...
... opposite angles taken together . Viz . to B and A. fig . 23 . B A fig . 23 . E Ņ Thro ' C , let CE be drawn parallel to AB ; then since BD cuts the two parallel lines BA , CE ; the angle ECD = B ( by part 3. of the last theo . ) and ...
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A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2021 |
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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