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 140
... bearings of lines ; which will be particularly shewn , when we come to treat of them . PROB . I. fig.88 . A B Let A and B be two houses on one side of a river , whose distance asunder is 293 perches : there is a tower at C on the other ...
... bearings of lines ; which will be particularly shewn , when we come to treat of them . PROB . I. fig.88 . A B Let A and B be two houses on one side of a river , whose distance asunder is 293 perches : there is a tower at C on the other ...
Σελίδα 169
... bearing of the first stationary line AB , let ' the line be measured , and the length thereof in chains and links be ... bearings and stationary distances . it 사 Having done with your first station , set the instru- ment over the hole ...
... bearing of the first stationary line AB , let ' the line be measured , and the length thereof in chains and links be ... bearings and stationary distances . it 사 Having done with your first station , set the instru- ment over the hole ...
Σελίδα 171
... and a fore - sight to E ; thus the bearings may be taken quite round , and the stationary distances being annexed to them , will complete the field - book . 1 But in this last method , care must be taken OF THE CIRCUMFERENTOR . 171.
... and a fore - sight to E ; thus the bearings may be taken quite round , and the stationary distances being annexed to them , will complete the field - book . 1 But in this last method , care must be taken OF THE CIRCUMFERENTOR . 171.
Σελίδα 173
... bearings , as before ; the difference of these bearings , if less than 180 , will be the quantity of degrees contained in the given an- gle ; but if more , take it from 360 , and the remainder will be the degrees contained in the given ...
... bearings , as before ; the difference of these bearings , if less than 180 , will be the quantity of degrees contained in the given an- gle ; but if more , take it from 360 , and the remainder will be the degrees contained in the given ...
Σελίδα 174
... either give the angles of the field , or the bearing of every stationary distance line , from the meredian ; as the circumferentor and quarter- ed compass do . First then , To take the angles of the field 174 OF THE THEODOLITE .
... either give the angles of the field , or the bearing of every stationary distance line , from the meredian ; as the circumferentor and quarter- ed compass do . First then , To take the angles of the field 174 OF THE THEODOLITE .
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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