The Field Engineer: A Handy Book of Practice in the Survey, Location, and Track-work of Railroads; Containing a Large Collection of Rules and Tables, Original and Selected Applicable to Both the Standard and the Narrow Gauge ...D. Van Nostrand Company, 1908 - 345 páginas |
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Página x
... curve . A. D. Apex distance : i.e. , the distance from the P. I. to the point where a curve merges in the tangent . P. C. Point of curve : the stake - mark at the beginning of a curve . P. T. Point of tangent : the stake - mark at the ...
... curve . A. D. Apex distance : i.e. , the distance from the P. I. to the point where a curve merges in the tangent . P. C. Point of curve : the stake - mark at the beginning of a curve . P. T. Point of tangent : the stake - mark at the ...
Página 36
... curve extending 150 feet each way . A circular are consuming so small an angle may be treated as a parabola , in which the external secant BF is equal to the versed sine FD . Referring to the above diagram , ordinates 4 and 8 will be ...
... curve extending 150 feet each way . A circular are consuming so small an angle may be treated as a parabola , in which the external secant BF is equal to the versed sine FD . Referring to the above diagram , ordinates 4 and 8 will be ...
Página 38
... the ordinates just found : - - 0.0 0.22 0.37 0.47 0.5 0.47 0.37 0.22 0.0 And the grade elevations on the curve will be : Example 4 . Elevation at A + 94.0 ; AB 94.0 94.47 94.87 95.22 95.5 95.72 95.87 95.97 96.0 88 VERTICAL CURVES .
... the ordinates just found : - - 0.0 0.22 0.37 0.47 0.5 0.47 0.37 0.22 0.0 And the grade elevations on the curve will be : Example 4 . Elevation at A + 94.0 ; AB 94.0 94.47 94.87 95.22 95.5 95.72 95.87 95.97 96.0 88 VERTICAL CURVES .
Página 39
... curve may be made by drawing the gradients to a scale of 2 feet to an inch vertical , and 50 feet to an inch horizontal . By means of the curve protractor ( Art . XXV . 1 ) a suitable arc may XIV . THE TRANSIT . - 1. Should the vernier ...
... curve may be made by drawing the gradients to a scale of 2 feet to an inch vertical , and 50 feet to an inch horizontal . By means of the curve protractor ( Art . XXV . 1 ) a suitable arc may XIV . THE TRANSIT . - 1. Should the vernier ...
Página 51
... curve . If one - third of the primary radius of 5,730 feet , or 1,910 feet , be used , the arc is called a three- degree curve ; and so on . 3. It should be borne in mind , however , that these measure- ments are supposed to be made ...
... curve . If one - third of the primary radius of 5,730 feet , or 1,910 feet , be used , the arc is called a three- degree curve ; and so on . 3. It should be borne in mind , however , that these measure- ments are supposed to be made ...
Términos y frases comunes
A. D. MIN adjustment apex distance backsight called central angle CHORD column cosec Cosine 1 Sine cross-hair Cube Roots cubic DATARIO decimal deflection distance degree of curvature degree of curve Diff divided elevation equal equivalent Example feet long figure fixed foregoing formation slope frog angle gauge of track gauge side given angle grade ground inches index angle instrument height intersection angle located logarithm M.
M. I Sine Main frog dist mantissa mark measure method metres middle ordinate minutes multiply number corresponding observation opposite outer rail perpendicular plane triangle quotient radii radius range REVERSED CURVE Sine 1 Cotang Square Roots standard gauge sub-chord Subtract Suppose switch-rail Table XVI tabular tance Tang tangential angle tangential distance telescope terminal tangent tion toe of switch Trigonometry turnout curve vernier vertical ΙΟ
Pasajes populares
Página 4 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Página 4 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers. log» MN = log» M + log
Página 13 - If the arc, or angle, is less than 45°, look for the degrees at the top of the page, and for the minutes in the...
Página 17 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Página 3 - THE LOGARITHM: of a number is the exponent of the power to which it is necessary to raise a fixed number, to produce the given number.
Página 15 - Is to the sum of the other two sides, So is the difference of those sides To the difference of the segments of the base.
Página 15 - AC, (Fig. 25.) is to their difference ; as the tangent of half the sum of the angles ACB and ABC, to the tangent of half their difference.
Página 13 - If the angle is greater than 45°, look for the degrees at the bottom of the page, and for the minutes in the right-hand column ; then follow the corresponding...
Página 15 - In any plane triangle, as twice the rectangle under any two sides is to the difference of the sum of the squares of those two sides and the square of the base, so is the radius to the cosine of the angle contained by the two sides.
Página 11 - The operation of finding the unknown parts is called the solution of the triangle. 2. A plane angle is measured by the arc of a circle included between its sides; the centre of the circle being at the vertex, and its radius being 1. The circle, for convenience, is divided into 360 equal parts called degrees; 90 of these parts are included in a quadrant, which includes one-quarter of the circle, and is the measure of a right angle. Each degree is further divided into 00 equal parts called minutes,...