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
... 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 content PREFACE . vii.
... 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 content PREFACE . vii.
Σελίδα 47
... scale are formed , is the chord of 60 degrees on the line of chords . THEOREM XVI . If in two triangles ABC , abc , all the angles of one , be each respectively equal to all the angles of the other , that is , A = a , B = b , C = c ...
... scale are formed , is the chord of 60 degrees on the line of chords . THEOREM XVI . If in two triangles ABC , abc , all the angles of one , be each respectively equal to all the angles of the other , that is , A = a , B = b , C = c ...
Σελίδα 68
... scale of chords take 60 degrees , for 60 is equal to the radius ( by cor . theo . 15. ) and with that distance from A , as a centre , describe a circle from the line AB ; take 45 degrees , the quantity of the given angle , from the same ...
... scale of chords take 60 degrees , for 60 is equal to the radius ( by cor . theo . 15. ) and with that distance from A , as a centre , describe a circle from the line AB ; take 45 degrees , the quantity of the given angle , from the same ...
Σελίδα 72
... scales of sines , tangents , & c . ready for use . Concerning Scales of equal Parts . If an inch be divided into any ... scale is completed . These numbers , 1 , 2 , 3 , 4 , & c . usually stand for 10 , 20 , 30 , 40 , & c . and every one ...
... scales of sines , tangents , & c . ready for use . Concerning Scales of equal Parts . If an inch be divided into any ... scale is completed . These numbers , 1 , 2 , 3 , 4 , & c . usually stand for 10 , 20 , 30 , 40 , & c . and every one ...
Σελίδα 73
... scale will make all easy :) the first of these surveyors call a scale of 10 , and the other a scale of 20 perches to an inch ; and are thus counted : every large division is 10 , every one of the subdivisions is 1 , and every one ...
... scale will make all easy :) the first of these surveyors call a scale of 10 , and the other a scale of 20 perches to an inch ; and are thus counted : every large division is 10 , every one of the subdivisions is 1 , and every one ...
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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