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 172
... east or west , and from the south to the east or west . The manner of using this part of the instrument is thus ; having directed your sights to the object , whether fore or back , as before ; observe the two cardinal points of your ...
... east or west , and from the south to the east or west . The manner of using this part of the instrument is thus ; having directed your sights to the object , whether fore or back , as before ; observe the two cardinal points of your ...
Σελίδα 173
... east , north and west , south and east , or south and west points in the bottom of the box , then put down NE , NW , SE or SW , annexing thereto the number of degrees cut by the needle on the side of the ring , counting from the north ...
... east , north and west , south and east , or south and west points in the bottom of the box , then put down NE , NW , SE or SW , annexing thereto the number of degrees cut by the needle on the side of the ring , counting from the north ...
Σελίδα 177
... east and west , or the situation of the land is obtained . Secondly , To take the bearing of each respective line from the meridian ; or to perform the office of a cir- cumferentor , or quartered compass , by the theodolite . Set your ...
... east and west , or the situation of the land is obtained . Secondly , To take the bearing of each respective line from the meridian ; or to perform the office of a cir- cumferentor , or quartered compass , by the theodolite . Set your ...
Σελίδα 188
... east , W. at the bottom of your paper for west . Then let the following field - book be that which is to be protracted , the bearings being taken from the meridian , whether by a circumferentor , theodolite , or semicircle , and ...
... east , W. at the bottom of your paper for west . Then let the following field - book be that which is to be protracted , the bearings being taken from the meridian , whether by a circumferentor , theodolite , or semicircle , and ...
Σελίδα 189
... east . Or if the right hand be made the north , and the left the south , the west will be then up , and the east down . In this case , if the degrees be less than 180 , turp the arc of your protractor upwards , or towards the west ; and ...
... east . Or if the right hand be made the north , and the left the south , the west will be then up , and the east down . In this case , if the degrees be less than 180 , turp the arc of your protractor upwards , or towards the west ; and ...
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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