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 páginas |
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Página vii
... distance being one chain ; which will be found as ready , by a little practice , and perhaps more exact , than those already published . Truths call upon me to acknowledge , that the me- thods by calculation , herein set forth , got ...
... distance being one chain ; which will be found as ready , by a little practice , and perhaps more exact , than those already published . Truths call upon me to acknowledge , that the me- thods by calculation , herein set forth , got ...
Página 31
... distance ; and that every magnitude has its half , third , fourth , & c . part . Note . Though these postulates are not always quoted , the reader will easily perceive where , and in what sense they are to be understood . AXIOMS OR SELF ...
... distance ; and that every magnitude has its half , third , fourth , & c . part . Note . Though these postulates are not always quoted , the reader will easily perceive where , and in what sense they are to be understood . AXIOMS OR SELF ...
Página 32
... distance , they will intersect each other . 9. Things which mutually agree with each other , are equal . NOTES . A theorem is a proposition , wherein something is proposed to be demonstrated . A problem is a proposition , wherein ...
... distance , they will intersect each other . 9. Things which mutually agree with each other , are equal . NOTES . A theorem is a proposition , wherein something is proposed to be demonstrated . A problem is a proposition , wherein ...
Página 37
... distance , as D , then ( by the last . ) ACD = B + A ; to both add ACB ; then ACD + ACB = A + B + ACB , but ACD + ACB = 2 right an- gles by theo . 1. ) therefore the three angles A + B + ACB = 2 right angles . Q. E. D. Cor . 1. Hence if ...
... distance , as D , then ( by the last . ) ACD = B + A ; to both add ACB ; then ACD + ACB = A + B + ACB , but ACD + ACB = 2 right an- gles by theo . 1. ) therefore the three angles A + B + ACB = 2 right angles . Q. E. D. Cor . 1. Hence if ...
Página 58
... . 44 . B D -C E In the lines AB and AC , from the point A set off equal distances AE - AD , then , with any distance more than the half of DE , describe two arcs to eut each other in some point F ; and the right 58 PROBLEMS .
... . 44 . B D -C E In the lines AB and AC , from the point A set off equal distances AE - AD , then , with any distance more than the half of DE , describe two arcs to eut each other in some point F ; and the right 58 PROBLEMS .
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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 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