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 31
... describing line CB . is called the semidiame- ter , or radius , or any line from the centre to the circum- ference ; whence all radii of the same , or of equal cir- cles are equal . 16. The diameter of a circle is a right line drawn ...
... describing line CB . is called the semidiame- ter , or radius , or any line from the centre to the circum- ference ; whence all radii of the same , or of equal cir- cles are equal . 16. The diameter of a circle is a right line drawn ...
Σελίδα 61
... describe an arc , and from L with LO describe another arc ; from O , the interjection point of those arcs , draw BO and OL , and BOL is the triangle required . This is manifest from the construction . PROB . II . At a point B in a given ...
... describe an arc , and from L with LO describe another arc ; from O , the interjection point of those arcs , draw BO and OL , and BOL is the triangle required . This is manifest from the construction . PROB . II . At a point B in a given ...
Σελίδα 62
... . B Z E -C In the lines AB and AC , from the point A set off equal distances AE = AD , then , with any distance more than the half of DE , describe two arcs to cut each other er in some point F ; and the right line 62 PROBLEMS .
... . B Z E -C In the lines AB and AC , from the point A set off equal distances AE = AD , then , with any distance more than the half of DE , describe two arcs to cut each other er in some point F ; and the right line 62 PROBLEMS .
Σελίδα 63
... describe two circles CFD , CGD , cutting each other in the points C and D ; draw CD , intersecting AB in E , then , AE = EB . For , if AC , AD , BC , BD , be drawn the triangles ACD , BCD , will be mutually equilateral and conse ...
... describe two circles CFD , CGD , cutting each other in the points C and D ; draw CD , intersecting AB in E , then , AE = EB . For , if AC , AD , BC , BD , be drawn the triangles ACD , BCD , will be mutually equilateral and conse ...
Σελίδα 64
... describe two arcs intersecting each other in B ; from A to B draw the line AB , and it will be the perpendicular required . For let CB , and BD be drawn ; then the triangles CAB , DAB , will be mutually equilateral and equian- gular ...
... describe two arcs intersecting each other in B ; from A to B draw the line AB , and it will be the perpendicular required . For let CB , and BD be drawn ; then the triangles CAB , DAB , will be mutually equilateral and equian- gular ...
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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