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 vii
... variation of the compass , by amplitudes and azimuths , with some of its uses ; to which is added , a table of the sun's declination ; how to ûnd by what scale a map is laid down , having the > map and area given ; how to find the ...
... variation of the compass , by amplitudes and azimuths , with some of its uses ; to which is added , a table of the sun's declination ; how to ûnd by what scale a map is laid down , having the > map and area given ; how to find the ...
Σελίδα 177
... variation . The circumferentor box may be then taken off . Direct the sights to the object at the second station , and the degree cut by the opposite end of the index will be the bearing of that line from the north , and the same that ...
... variation . The circumferentor box may be then taken off . Direct the sights to the object at the second station , and the degree cut by the opposite end of the index will be the bearing of that line from the north , and the same that ...
Σελίδα 254
... Variation of the Compass , and its Uses in Surveying ; the whole concluding with some necessary necessary Direc- tions concerning Surveys in general . OF OFF - SETS . IN taking surveys it is unnecessary and unusual to make a station at ...
... Variation of the Compass , and its Uses in Surveying ; the whole concluding with some necessary necessary Direc- tions concerning Surveys in general . OF OFF - SETS . IN taking surveys it is unnecessary and unusual to make a station at ...
Σελίδα 268
... ing the maps given and the scale by which they were laid down , your reason will be sufficient to direct you to know , what scale they should be reduced to . THE VARIATION OF THE COMPASS . And how to find 268 TO ENLARGE OR DIMINISH MAPS .
... ing the maps given and the scale by which they were laid down , your reason will be sufficient to direct you to know , what scale they should be reduced to . THE VARIATION OF THE COMPASS . And how to find 268 TO ENLARGE OR DIMINISH MAPS .
Σελίδα 269
... variation of the needle , or compass . This variation differs widely in many places ; for in some , the needle will point several degrees on the west side of the north ; at others there will be little or no variation , and again , at ...
... variation of the needle , or compass . This variation differs widely in many places ; for in some , the needle will point several degrees on the west side of the north ; at others there will be little or no variation , and again , at ...
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A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2021 |
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