## 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 Selected |

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### Common terms and phrases

assume base calculated called central angle centre line chord column correction corresponding Cosin Sine Cosin Cotang Tang course cross deflection degree of curve determined Diff difference direction distance draw elevation engineer equal error estimate feet figure formula frog given gives grade ground half height Hence horizontal inches intersect joining laid length less limit locate long chord maximum measured middle miles necessary notes observed obtained offset opposite parallel pass perpendicular position produced proper PROPORTIONAL R₁ R₂ radius rail reading resistance road side Sine Cosin Sine slope Square stakes station straight subchord surface survey Table taken Tang Tang Cotang tangent tangent point tion track train transit triangle turnout usually vers vertical

### Popular passages

Page 239 - 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 199 - 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 256 - 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 254 - 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 56 - Of mensuration, trigonometry, surveying, hydraulics, hydrostatics, instruments and their adjustments, strength of materials, masonry, principles of wooden and iron roof and bridge trusses, stone bridges and culverts, trestles, pillars, suspension bridges, dams, railroads, turnouts, turning platforms, water stations, cost of earthwork, foundations, retaining walls, etc.

Page 259 - 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 225 - 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 259 - 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 254 - ... 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.

Page 56 - Together with Directions for Estimating the Cost of Earthwork. By John C. Trautwine, CE Ninth edition, revised and enlarged by John C.