A treatise on highway construction . FIG. OF CROSSING- MISCELLANEOUS PAVEMENTS 355. Fig. 32—Junction of Curves with Straight LiNb 356 HIGHWAY CONSTRUCTION. avoid excessive work of construction. There were two hi]ls each amile in length, with an inclination of 5 : 100. To reduce this to a4^ per cent grade would have cost $100,000, but nearly the sameadvantage in diminishing the amount of tractive force required wasobtained by making stone trackways at a total expense of one halfthe former amount and retaining the 5 per cent grade with moderatecutting and embankment. To draw one ton ove
A treatise on highway construction . FIG. OF CROSSING- MISCELLANEOUS PAVEMENTS 355. Fig. 32—Junction of Curves with Straight LiNb 356 HIGHWAY CONSTRUCTION. avoid excessive work of construction. There were two hi]ls each amile in length, with an inclination of 5 : 100. To reduce this to a4^ per cent grade would have cost $100,000, but nearly the sameadvantage in diminishing the amount of tractive force required wasobtained by making stone trackways at a total expense of one halfthe former amount and retaining the 5 per cent grade with moderatecutting and embankment. To draw one ton over the originalhills required a tractive force of 294 pounds; to draw the same loadover the trackways laid on the same inclinations required only 133pounds. Trackways of both stone and iron have been used in London,Liverpool, Manchester, Glasgow, and other cities. 438. The Italian trackways consist of two parallel lines of graniteblocks, usually 14 inches wide, 8 inches deep, and 5 feet in length,bedded in a layer of sand. The lines are 38 inches apart, and the in-terspace, or footway f
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkjwileysons
