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 Joseph Cushing, 1816 - 472 páginas |
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Página xi
... variation of the compass by amplitudes and azimuths , with some of its uses ; to which is ad- ded , a table of the sun's declination : how to find 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 ad- ded , a table of the sun's declination : how to find by what scale a map is laid down , having the map and area given : how to find the ...
Página 181
... 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 ...
Página 258
... Variation of the Compass , and its Uses in Surveying ; the whole concluding with some neces- sary Directions concerning Surveys in general . IN OF OFF - SETS . IN taking surveys it is unnecessary and unusual to make a station at every ...
... Variation of the Compass , and its Uses in Surveying ; the whole concluding with some neces- sary Directions concerning Surveys in general . IN OF OFF - SETS . IN taking surveys it is unnecessary and unusual to make a station at every ...
Página 273
... variation of the needle , or com- pass . 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 com- pass . 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 ...
Página 274
... pole . 9. The sun's altitude , is the number of degrees and minutes the sun is above the horizon , and is easily found by a quadrant , as before . 1 10. What the sun's altitude wants of 90 , or 274 THE VARIATION OF THE COMPASS .
... pole . 9. The sun's altitude , is the number of degrees and minutes the sun is above the horizon , and is easily found by a quadrant , as before . 1 10. What the sun's altitude wants of 90 , or 274 THE VARIATION OF THE COMPASS .
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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 50 Dist ABCD acres altitude annexed Answer base bearing bisect blank line centre chains and links chord circle circumferentor Co-secant Secant Co-sine Co-tang column contained cyphers decimal decimal fraction Dep Lat difference 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 magnetical measure meridian distance multiplied needle number of degrees object off-sets parallel parallelogram perpendicular piece of ground plane Portmarnock PROB proportion protractor quotient radius right angles right line scale of equal SCHOLIUM sect semicircle side sights sine square root stationary distance sun's suppose survey taken tance Tang tangent thence theo theodolite THEOREM thro trapezium triangle ABC trigonometry true amplitude true azimuth two-pole chains vane variation whence