A Practical Treatise on the Construction and Formation of Railways, Containing the Most Approved Systems of Excavating, Haulage, Embanking, Permanent Waylaying, &C.&C: Also, the Method of Estimating the Gross Load and Useful Effect Produced by Mechanical
A Practical Treatise on the Construction and Formation of Railways, Containing the Most Approved Systems of Excavating, Haulage, Embanking, Permanent Waylaying, &C.&C: Also, the Method of Estimating the Gross Load and Useful Effect Produced by Mechanical
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1848 Excerpt: ...by the former method of calculating the average distance is in all cases the same; it is therefore clearly erroneous. When the quantity of earth is considerable, or a great distance to be removed, the average lead becomes important, and therefore should be calculated with accuracy. Those conversant with the subject ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1848 Excerpt: ...by the former method of calculating the average distance is in all cases the same; it is therefore clearly erroneous. When the quantity of earth is considerable, or a great distance to be removed, the average lead becomes important, and therefore should be calculated with accuracy. Those conversant with the subject easily determine a length sufficiently near for practice; but cases frequently occur when the precise length is required, or at least a close approximation. For this purpose we suggest the following rule. Divide the length of the embankment into separate portions, according to the irregularity of its height, as shown at D, E, and F, and ascertain (from the Earthwork Tables in the latter part of this work) their respective cubic contents. Next measure the depth of the cutting at A, and in the same table it will readily be seen what length of A is requisite to complete D. Or, if the cut be very irregular in depth, it may be taken in different lengths until they will produce a sufficiency for D. The parts B and C are similarly calculated. Multiply the cubic content of each piece of cut, by the sum of one-half its length, one-half the length of each corresponding piece of embankment, and the whole length of each intervening portion of cut and embankment. Add their products together. Divide the aggregate by the total number of cubic yards of cutting, and the quotient will be the average distance that the whole will have to be conveyed. Ex. In the following section the contents of the embankment are as follows: --D, 7000; E, 17,800; and F, 25,600 cubic yards; their lengths are 12, 10, and 6 chains respectively, and the several portions of cutting to form the same are Cubic ji%. Chains. A 7,000 and its length 15 B 17,800... 11 C 25,600...8 required the a..
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