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 9
... suppose unity , or any one thing to be divided into an assigned number of equal parts , this number is called the denominator ; and if we chuse to take any number of such parts less than the whole , this is called the numerator of a ...
... suppose unity , or any one thing to be divided into an assigned number of equal parts , this number is called the denominator ; and if we chuse to take any number of such parts less than the whole , this is called the numerator of a ...
Σελίδα 49
... suppose that to be Ag , which will be contained twice in AB , and three times in BD , the parts Ag , gB , Bh , hi , and iD being all equal , and let the lines gC , hC and iC , be drawn : then ( by cor . to theo . 13. ) all the small ...
... suppose that to be Ag , which will be contained twice in AB , and three times in BD , the parts Ag , gB , Bh , hi , and iD being all equal , and let the lines gC , hC and iC , be drawn : then ( by cor . to theo . 13. ) all the small ...
Σελίδα 58
... suppose one triangle be laid on the other , the sides will mutually agree with each other , and therefore be equal ; for if we consider these two triangles are made of the same given three fines , they are manifestly one and the same ...
... suppose one triangle be laid on the other , the sides will mutually agree with each other , and therefore be equal ; for if we consider these two triangles are made of the same given three fines , they are manifestly one and the same ...
Σελίδα 68
... suppose , of 45 degrees , fig . 56 . flg . 56 . From a scale of chords take 60 degrees , for 60 is equal to the radius ( by cor . theo . 15. ) and with that distance from A , as a centre , describe a circle from the line AB ; take 45 ...
... suppose , of 45 degrees , fig . 56 . flg . 56 . From a scale of chords take 60 degrees , for 60 is equal to the radius ( by cor . theo . 15. ) and with that distance from A , as a centre , describe a circle from the line AB ; take 45 ...
Σελίδα 87
... , by the sine and co - sine . The co - sine taken from the sine added to 90 , or radius which is 10.00000 , the remainder is the tan- gent , ( by part 1. theo . 24. ) EXAMPLE . 1. Suppose the tangent of 41 ° . OF LOGARITHMS . 87.
... , by the sine and co - sine . The co - sine taken from the sine added to 90 , or radius which is 10.00000 , the remainder is the tan- gent , ( by part 1. theo . 24. ) EXAMPLE . 1. Suppose the tangent of 41 ° . OF LOGARITHMS . 87.
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Συχνά εμφανιζόμενοι όροι και φράσεις
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