The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 156
h of formation level, 30 feet. Find area by the formula (5). Substitute the above values in (5) : (33-I-40) 20-[- (16-5-1-40)=-^-—^=2504-7, area required. 4-00 — 180 2. Given the length 20 feet on descent of ground ; difference ofheights by level, 6 feet; intended slopes, 1 to 1 ; depth of… … Fig. 2. From the above it may be observed, that when a centre line ofrailway is ranged and staked out, and the depths known on in-clined ground, we can always find most expeditiously the area ofany vertical cross-section, by means of the spirit-level, without re-quiring the distances of the side…
Architecture · Civil engineering · Science
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