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 167
... needle touched with a load stone , which always retains the same situation ; that is , it always points to the North and South point of the horizon nearly , when the instrument is hori . zontal , and the needle at rest . The box is ...
... needle touched with a load stone , which always retains the same situation ; that is , it always points to the North and South point of the horizon nearly , when the instrument is hori . zontal , and the needle at rest . The box is ...
Página 168
... needle , will give the number to be placed in the second column of your field - book in a line with station No. 1 , and expresses the number of degress the stationary line is from the north , counting quite round with the sun . Most needles ...
... needle , will give the number to be placed in the second column of your field - book in a line with station No. 1 , and expresses the number of degress the stationary line is from the north , counting quite round with the sun . Most needles ...
Página 169
... needle . Two - pointed needles have sometimes a ring , but more usually a cross towards the north end and the south end is generally bearded towards its extremity , and sometimes not , but its arm is a naked right - line . from the cap ...
... needle . Two - pointed needles have sometimes a ring , but more usually a cross towards the north end and the south end is generally bearded towards its extremity , and sometimes not , but its arm is a naked right - line . from the cap ...
Página 170
... needle , which will be the same as if they were taken from the object to the instrument , the direction of the index being the Let the degree be inserted in the field - book , and the stationary distance be measured and annexed thereto ...
... needle , which will be the same as if they were taken from the object to the instrument , the direction of the index being the Let the degree be inserted in the field - book , and the stationary distance be measured and annexed thereto ...
Página 171
... needle . Again from B observe an object at C , with the north of the box to your eye , and set down the degree cut by the south point of the needle , so have you the bear- ings of the lines AB and BC ; you may then set up your ...
... needle . Again from B observe an object at C , with the north of the box to your eye , and set down the degree cut by the south point of the needle , so have you the bear- ings of the lines AB and BC ; you may then set up your ...
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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