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 129
... FROGS AND SWITCHES . T SID M W N TO FIND THE RADIUS OF A TURNOUT CURVE , THE FROG ANGLES , AND THE DISTANCES FROM THE TOE OF SWITCH TO THE FROG POINTS . 1. Draw the figure as in margin , C being the centre of the turnout curve , CK ...
... FROGS AND SWITCHES . T SID M W N TO FIND THE RADIUS OF A TURNOUT CURVE , THE FROG ANGLES , AND THE DISTANCES FROM THE TOE OF SWITCH TO THE FROG POINTS . 1. Draw the figure as in margin , C being the centre of the turnout curve , CK ...
Página 130
... frog point O , NOP NHW FS . The angle NOL or NLO , be- half the intersection angle HNW ― = tween chord and tangent , = = = ( FS ) . The angle NOB = NOL + LOB . But NOL is seen to be S ) , and NOB = F ; then LOB = = = ( F NOB - NOL = F ...
... frog point O , NOP NHW FS . The angle NOL or NLO , be- half the intersection angle HNW ― = tween chord and tangent , = = = ( FS ) . The angle NOB = NOL + LOB . But NOL is seen to be S ) , and NOB = F ; then LOB = = = ( F NOB - NOL = F ...
Página 131
... frog angle . 13. To find the Angle of the Middle Frog , in the Case of a Double Turnout . Call the natural cosine of the main frog angle a . Divide half the gauge of track by the radius of outer rail of turnout curve ; call the quotient ...
... frog angle . 13. To find the Angle of the Middle Frog , in the Case of a Double Turnout . Call the natural cosine of the main frog angle a . Divide half the gauge of track by the radius of outer rail of turnout curve ; call the quotient ...
Página 132
... frog shall be fair and regular . How trackmen may do this without the use of instruments , in a very simple way , will be shown hereafter . Not that frogs may be set hap - hazard , and the approaches forced to fit : they ought to be ...
... frog shall be fair and regular . How trackmen may do this without the use of instruments , in a very simple way , will be shown hereafter . Not that frogs may be set hap - hazard , and the approaches forced to fit : they ought to be ...
Página 133
... frog distance ; say , 65 feet . 19. If the switch - rail be curved , the formula would stand thus : - F = 8.6 L N L + 0.84 N Which may be made a written rule as follows ... frog is equal to 3,440 difference . FROGS AND SWITCHES . 133.
... frog distance ; say , 65 feet . 19. If the switch - rail be curved , the formula would stand thus : - F = 8.6 L N L + 0.84 N Which may be made a written rule as follows ... frog is equal to 3,440 difference . FROGS AND SWITCHES . 133.
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,...