A Practical Treatise On Railway Curves And Location for Young Engineers
The book A Practical Treatise On Railway Curves And Location for Young Engineers was written by author William Findlay Shunk Here you can read free online of A Practical Treatise On Railway Curves And Location for Young Engineers book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Practical Treatise On Railway Curves And Location for Young Engineers a good or bad book?
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31, = A. Move up, and sight back to sta. 28. The index now reads 20. Multiplying by 2, and subtracting the last tangent, we have the reading of the tangent at h = 26 : we have turned 26 of the curve. Continue as before. After putting in sta. 33, to find the deflexion which shall fix the P. T. , 33 + 30, say, as 100 feet : 30 feet : : 2 : the re- quired deflexion, = 36'. We may here remark the great convenience of an instrument graduated to hundredths of* a degree instead of sixtieths. In the pr...esent example it would be seen immediately that the tangential angle for 100 feet being 2, for 1 foot it would be 2 hundredths of a degree, and for 30 feet it would be 60 hundredths. Well ! when the P. T. , = 33 + 30, is fixed, the index reads 30 36'. Move up, see that the vernier has not been disturbed, and sight back to sta. 31. Now twice the index reading, minus the last tangent, = 61 12' 26, = 35 12^ the present tangent, which is the final tangent, which finishes the curve. The advantage of this manner of running a curve is that the instrument shows at a glance the work done, and there- fore errors may be detected with greater facility.
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