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 σελίδες |
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Σελίδα xi
... 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 content of ground that is sur- veyed by a chain that is too long or too PREFACE . xi.
... 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 content of ground that is sur- veyed by a chain that is too long or too PREFACE . xi.
Σελίδα 129
... sun's altitude , requisite to be known in many astronomical cases ; this is effected by letting the sun's ray , which passes thro ' the upper sight , fall upon the hole in the lower one ; and the degree then cut by the thread , will be ...
... sun's altitude , requisite to be known in many astronomical cases ; this is effected by letting the sun's ray , which passes thro ' the upper sight , fall upon the hole in the lower one ; and the degree then cut by the thread , will be ...
Σελίδα 131
... sun shines , as well as the length of the shadow of the object , whose height is required ; and you have the proper requisites given . Thus , 1 ab , the length of the shadow of the staff , 15 feet . cb , the length of the staff , 10 ...
... sun shines , as well as the length of the shadow of the object , whose height is required ; and you have the proper requisites given . Thus , 1 ab , the length of the shadow of the staff , 15 feet . cb , the length of the staff , 10 ...
Σελίδα 132
... sun ; whence the angle a = A ( by part 3. theo . 3. sect . 1. ) and consequently c -C . The triangles being therefore mutually equiangu- lar are similar ( by theo . 16. sect 1. ) it will be , ab : bc :: AB : BC , 90 the height ...
... sun ; whence the angle a = A ( by part 3. theo . 3. sect . 1. ) and consequently c -C . The triangles being therefore mutually equiangu- lar are similar ( by theo . 16. sect 1. ) it will be , ab : bc :: AB : BC , 90 the height ...
Σελίδα 172
... sun . Most needles are pointed at the south end , and have a small ring at the north : such needles are better than those which are pointed at each end , because the sur- veyor cannot mistake by counting to a wrong end ; 172 OF THE ...
... sun . Most needles are pointed at the south end , and have a small ring at the north : such needles are better than those which are pointed at each end , because the sur- veyor cannot mistake by counting to a wrong end ; 172 OF THE ...
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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 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