A Brief Practical Treatise on the Construction and Manage...
Owen, Robert Dale Excerpt from A Brief Practical Treatise on the Construction and Management of Plank Roads
Laying Out, Passion for straightness great error. Valiant effort of courage and science. Rule as to circuit that maybe profitably made to avoid a hill. Case in point. Increase by divergence small. Divergence from air-line perpendicular as well as horizontal. Northern and southern slopes. Trestle-bridges replacing embankments. How a little forethought may...