. A manual of the principles and practice of road-making : comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and railroads . RECONNAISSANCE. 83 shall just suffice to fill the hollows. The gain by savingof distance may balance the cost of cutting and filling. Fiff. When the route follows the valley of a stream, it mayconform to its sinuosities, if the turns are not too abrupt,and if the cuttings and fillings on a straighter line wouldbe too expensive, but should approximate to the latterplan, if the importance of the road and the funds at
. A manual of the principles and practice of road-making : comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and railroads . RECONNAISSANCE. 83 shall just suffice to fill the hollows. The gain by savingof distance may balance the cost of cutting and filling. Fiff. When the route follows the valley of a stream, it mayconform to its sinuosities, if the turns are not too abrupt,and if the cuttings and fillings on a straighter line wouldbe too expensive, but should approximate to the latterplan, if the importance of the road and the funds at com-mand will justify the increased cost. The former plan,however, generally gives the cheapest and most levelroute ; and guided by this principle a blind man was for along time the very best layer out of roads in the hilly re-gions of Yorkshire and Derbyshire. He followed thestreams closely, and when they made too sharp bends,he sought in these arcs the straightest chords whichpassed over practicable ground. When a valley is to be crossed, the route should gen-erally deviate from the straight line ACB, (Fig. 28) andcurve towards the head of the valley ADB, which there isusually shallower and narrower. If it deviated in the other 84 THE LOCATION OF ROADS.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectrailroa, bookyear1853
