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 34
... six sides a hexagon , & c . but if their sides are not equal to each other , then they are called irregular polygons ; as an irregular pentagon , hexagon , & c . 36. Four quantities are said to be in proportion when 34 GEOMETRY .
... six sides a hexagon , & c . but if their sides are not equal to each other , then they are called irregular polygons ; as an irregular pentagon , hexagon , & c . 36. Four quantities are said to be in proportion when 34 GEOMETRY .
Página 35
... quantities are said to be in proportion when the product of the extremes is equal to that of the means : thus if A multiplied by D , be equal to B multiplied by C , then A is said to be to B as C is to D. POSTULATES OR PETITIONS . 1 ...
... quantities are said to be in proportion when the product of the extremes is equal to that of the means : thus if A multiplied by D , be equal to B multiplied by C , then A is said to be to B as C is to D. POSTULATES OR PETITIONS . 1 ...
Página 37
... quantity which it precedes to be subtracted . The sign x , denotes the quantities , between them to be multiplied ... quantity is repeated , and they are written A : B :: B : C. GEOMETRICAL THEOREMS . THEOREM I. IF a right line falls ...
... quantity which it precedes to be subtracted . The sign x , denotes the quantities , between them to be multiplied ... quantity is repeated , and they are written A : B :: B : C. GEOMETRICAL THEOREMS . THEOREM I. IF a right line falls ...
Página 53
... quantities con . nected with the sign : the conclusion is always drawn from the first two and last two proportionals . THEOREM XIX . Triangles ABC . DEF , standing upon equal bases AB and DE , are to each other as their altitudes CG and ...
... quantities con . nected with the sign : the conclusion is always drawn from the first two and last two proportionals . THEOREM XIX . Triangles ABC . DEF , standing upon equal bases AB and DE , are to each other as their altitudes CG and ...
Página 72
... quantity of the given an- gle , from the same scale of chords , and lay it on that circle from a to b , thro ' A and b , draw the line AbC ; and the angle A , will be an angle of 45 degrees , as required . If the given angle were more ...
... quantity of the given an- gle , from the same scale of chords , and lay it on that circle from a to b , thro ' A and b , draw the line AbC ; and the angle A , will be an angle of 45 degrees , as required . If the given angle were more ...
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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