. A manual of the principles and practice of road-making: comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and rail-roads . 361 with area 0, at the preceding intermediate station, and at this sta- 10 X 2tion its area, Fig. 153, is = 10. ° 2 At station G, the cross-section resembles that at station 3, in-Fig. X 10. X 10. X verted, and is calculated in the same manner by division intotriangles, as is shown in Fig. 154. 10 X 3 Left-hand triangle - =Risfht-hand triancjle - = 210 X 6 = SO. rj. . , 4X (6+10+10 + 12) .. Two remammg t
. A manual of the principles and practice of road-making: comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and rail-roads . 361 with area 0, at the preceding intermediate station, and at this sta- 10 X 2tion its area, Fig. 153, is = 10. ° 2 At station G, the cross-section resembles that at station 3, in-Fig. X 10. X 10. X verted, and is calculated in the same manner by division intotriangles, as is shown in Fig. 154. 10 X 3 Left-hand triangle - =Risfht-hand triancjle - = 210 X 6 = SO. rj. . , 4X (6+10+10 + 12) .. Two remammg triangles = = /o. Entire area, . - . = station 7, tl\e embankment runs out, and the area = 0. MEAN HEIGHTS. To apply the prismoidal formula to cases of irregular cross-seClions, it is necessary to calculate the mean heights of these cross-sections, to be subsequently averaged together to find the middleheight; which produces the middle area. The following problem istherefore to be solved : Given the area of any irregular section, re-quired the mean height which would produce the same area, thebase and slopes remaining the same. 368 155. X 8S
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectrailroa, bookyear1853
