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 x
... heights and distances . The third section gives an account of the chains and measures used in Great - Britain an Ireland ; methods of surveying and of taking inaccessible distances by the chain only , with some necessary problems ; also ...
... heights and distances . The third section gives an account of the chains and measures used in Great - Britain an Ireland ; methods of surveying and of taking inaccessible distances by the chain only , with some necessary problems ; also ...
Σελίδα 33
... height of the triangle ABC , standing on BC as its base , fig . 16 . B 16 . Hence all triangles between the same parallels have the same height , since all the perpendiculars are equal from the nature of parallel lines . 28. Any figure ...
... height of the triangle ABC , standing on BC as its base , fig . 16 . B 16 . Hence all triangles between the same parallels have the same height , since all the perpendiculars are equal from the nature of parallel lines . 28. Any figure ...
Σελίδα 127
... gone through plane trigonometry , we shall now proceed to apply the same , in determining the measures of inaccessible heights and distances . OF HEIGHT T HE instrument of least expense for taking PLANE TRIGONOMETRY . 127.
... gone through plane trigonometry , we shall now proceed to apply the same , in determining the measures of inaccessible heights and distances . OF HEIGHT T HE instrument of least expense for taking PLANE TRIGONOMETRY . 127.
Σελίδα 128
... HEIGHT T HE instrument of least expense for taking heights , is a quadrant , divided into 90 equal parts or degrees ; and those may be subdivided into halves , quarters , or eights , according to the radius , or size of the instru- ment ...
... HEIGHT T HE instrument of least expense for taking heights , is a quadrant , divided into 90 equal parts or degrees ; and those may be subdivided into halves , quarters , or eights , according to the radius , or size of the instru- ment ...
Σελίδα 129
... height of a perpendicular object at one sta- tion , which is on an horizontal plane . Given , A STEEPLE . The angle of altitude , 53 degrees . Distance from the observer to the foot of the steeple , or the base , 85 feet . Height of the ...
... height of a perpendicular object at one sta- tion , which is on an horizontal plane . Given , A STEEPLE . The angle of altitude , 53 degrees . Distance from the observer to the foot of the steeple , or the base , 85 feet . Height of the ...
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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