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 |
Dentro del libro
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Página ix
... and the denominator the root . B. M. Bench - mark ; any fixed reference point for the level , ix as outcropping ledge , water - table of building , Radii and their logarithms, middle ordinates, and deflection distances 155.
... and the denominator the root . B. M. Bench - mark ; any fixed reference point for the level , ix as outcropping ledge , water - table of building , Radii and their logarithms, middle ordinates, and deflection distances 155.
Página 3
... fixed number must be multiplied by itself in order to produce any given number . The fixed number is called the base of the system . In the common system , this base is 10 . It follows from the above , that the logarithm of any power of ...
... fixed number must be multiplied by itself in order to produce any given number . The fixed number is called the base of the system . In the common system , this base is 10 . It follows from the above , that the logarithm of any power of ...
Página 24
... fixed , and are therefore inaccessible . The adjustment , however , is one not liable to become deranged in either instrument , and , in the transit , is of comparatively small importance . 4. The young practitioner should bear in mind ...
... fixed , and are therefore inaccessible . The adjustment , however , is one not liable to become deranged in either instrument , and , in the transit , is of comparatively small importance . 4. The young practitioner should bear in mind ...
Página 30
... fix the point where any proposed formation slope must meet the surface on level ground , is quite simple ; the distance from the centre line being obviously made up of half the width of road - bed added to the horizontal distance due ...
... fix the point where any proposed formation slope must meet the surface on level ground , is quite simple ; the distance from the centre line being obviously made up of half the width of road - bed added to the horizontal distance due ...
Página 31
... fixed at 15.5 above grade , the next step is a guess how far out from the centre stake the formation slope would proba- bly meet the ground surface . The closeness of the guess will correspond to the experience and natural skill of the ...
... fixed at 15.5 above grade , the next step is a guess how far out from the centre stake the formation slope would proba- bly meet the ground surface . The closeness of the guess will correspond to the experience and natural skill of the ...
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,...