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Curve ranging for civil engineering work is usually carried out be
creating
a set of small chords on the intended circle. The offset or deviation of the circle from a straight line is measured either as a dimension (originally with a linen tape from a straight laid chain,) or as an angle by theodolite from sighted ranging rods. As a rule of thumb (aren't they all) the chord should not exceed one twentieth the circles radius. Road curves are actually calculated to give a maximum acceleration at a
given vehicle speed.
No doubt even civil engineers as well as dial
makers are using laser rangers and electronic distance measuring devices these days. Surveying by Bannister and Raymond ISBN 0273 00799 8 gives a good account Related: :Macintosh HD:Glacier%20Bkgrd.jpg:000238FC:221697C3:00000000:00000000 |
Title: Glacier
