Field Engineering: A Hand-book of the Theory and Practice of Railway Surveying, Location, and Construction, Designed for the Class-room, Field, and Office, and Containing a Large Number of Useful Tables, Original and SelectedJ. Wiley & sons, 1899 - 503 pages |
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Common terms and phrases
9 Diff A₁ A₂ assume Base Base Base bisecting calculated central angle centre line column compound curve correction Cosin Sine Cosin Cotang Tang Cotang cross-hair Cube Cube Roots cubic yards curvature deflection degree of curve diagram distance elevation embankment engineer equal estimate exsec feet fifth column formula frog given curve Hence horizontal inches instrument intersect length locate log ex logarithm long chord main line main track mantissa maximum grade measured middle ordinate obtained offset parallel tangent perpendicular point of curve prismoid produced PROPORTIONAL R₁ R₂ radius ratio resistance right angles road S₁ secant side simple curve Sine Cosin Sine square station straight subchord subtract surface survey Table taken Tang Cotang Tang tangent point tion transit point triangle tunnel turnout vertex vertical Δι
Popular passages
Page 243 - Haul. The cost of removing excavated material, when the distance does not exceed a certain specified limit, is included in the price per cubic yard of the material as measured in the cutting. But when the material must be carried beyond this limit, the extra distance is paid for at a stipulated price per cubic yard, per 100 feet. The extra distance is known by the name of haul...
Page 203 - Fig. 8, thus slightly changing the grade at and near the point of intersection. A vertical curve rarely need extend more than 200 feet each way from that point.
Page 260 - At the end of table XXIV. is a small table of logarithms of numbers from 1 to 100, with the characteristic prefixed, for easy reference when the given number does not exceed two digits. But the same mantissas may be found in the larger table. TABLE XXV.— The logarithmic sine, tangent, etc.
Page 258 - XXFV. contains the mantissas of logarithms, carried to six places of decimals, for numbers between 1 and 9999, inclusive. The first three figures of a number are given in the first column, the fourth at the top of the other columns. The first two figures of the mantissa are given only in the second column, but these are understood to apply to the remaining four figures in either column following, which are comprised between the same horizontal lines with the two.
Page 263 - Il — q, whence n is easily found. Find in the first column two consecutive quantities between which the number n falls, and if the degrees are read from the left hand side of the page, adopt the less, take out the minutes from the second column, and take for the seconds the difference between the quantity adopted and the number п.
Page 229 - A' = the areas at the two parallel ends, and M = the area of a section midway between the ends. This area is not a mean of the other two, but the linear dimensions of the mid-section are means of the corresponding dimensions severally of the end sections; from which therefore the area of the mid section may be computed.
Page 263 - Find in the proper column two consecutive logarithms between which the given logarithm falls. If the title of the given function is found at the top of that column read the degrees from the top of the page; if at the bottom read from the bottom. Find the value of (q...
Page 258 - ... of the calculation. By this rule we have Number. Logarithm. 1.384 0.141136 .1384 9.141136 .01384 8.141136 .001384 7.141136 etc. etc. No confusion need arise from this method in finding" a number from its logarithm; for although the logarithm 6.141136 represents either the number 1,384,000, or the decimal .0001384, yet these are so diverse in their values that we can never be uncertain in a given problem which to adopt.