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 93
... tang . of 29 ° . 50 ′ req . 20.00000 10.24148 9.75852 4. To find the secant by the help of a co - sine ; which may be found of great use when a table of sines and tangents can only be had . From twice the radius , which is 20.00000 ...
... tang . of 29 ° . 50 ′ req . 20.00000 10.24148 9.75852 4. To find the secant by the help of a co - sine ; which may be found of great use when a table of sines and tangents can only be had . From twice the radius , which is 20.00000 ...
Página 280
... ° —19 ° .03 ′ = 70 ° .57 ' , the sun's dist . from the pole 52.30 compt . of the altitude 123.27 sum 61.43 half sum 18.27 difference 9.13 half difference As the tang . of the compt . of the 280 THE VARIATION OF THE COMPASS .
... ° —19 ° .03 ′ = 70 ° .57 ' , the sun's dist . from the pole 52.30 compt . of the altitude 123.27 sum 61.43 half sum 18.27 difference 9.13 half difference As the tang . of the compt . of the 280 THE VARIATION OF THE COMPASS .
Página 281
... tang . of the compt . of the latitude , } Is to the tangent of the sum of the distance of the sun from the pole and com- plement of the altitude , ;; tang . of their difference 18 ° 23 ' - 9.52031 61.43-10.26916 9.13-9.21022 19.47938 To ...
... tang . of the compt . of the latitude , } Is to the tangent of the sum of the distance of the sun from the pole and com- plement of the altitude , ;; tang . of their difference 18 ° 23 ' - 9.52031 61.43-10.26916 9.13-9.21022 19.47938 To ...
Página 293
... tang . 4 A = 58 ° 43 ' As Sine of 4 A : DC :: R : AC = 32.76 EXAMPLE II . 1 B Suppose AB 11.50 chains ; angle A 46 ° , and the A. R. P. area 9.0.32 ; to find the sides . Answer , AC = 22,24 . BC = 16.48 . EXAMPLE III . Given the area 10 ...
... tang . 4 A = 58 ° 43 ' As Sine of 4 A : DC :: R : AC = 32.76 EXAMPLE II . 1 B Suppose AB 11.50 chains ; angle A 46 ° , and the A. R. P. area 9.0.32 ; to find the sides . Answer , AC = 22,24 . BC = 16.48 . EXAMPLE III . Given the area 10 ...
Página 305
... tang . of A = s ; Co. tang . of B = r , and the perpendicular af = x ; then as 1 : x :: s : sx = Af ; and as 1 : x :: r : rx equal ab is - a - sx + rx and Bd ; therefore , fd , or its AB + ab = a¬1⁄2 sx + 1rx put ns - r ; and R for the ...
... tang . of A = s ; Co. tang . of B = r , and the perpendicular af = x ; then as 1 : x :: s : sx = Af ; and as 1 : x :: r : rx equal ab is - a - sx + rx and Bd ; therefore , fd , or its AB + ab = a¬1⁄2 sx + 1rx put ns - r ; and R for the ...
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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