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
... elevations in levelling . H. I. Height of instrument : elevation of the level above the datum or zero plane . H. W. High water . L. W. Low water . LOGARITHMS . I.-II. LOGARITHMS . I. DEFINITIONS AND PRINCIPLES . ABBREVIATIONS .
... elevations in levelling . H. I. Height of instrument : elevation of the level above the datum or zero plane . H. W. High water . L. W. Low water . LOGARITHMS . I.-II. LOGARITHMS . I. DEFINITIONS AND PRINCIPLES . ABBREVIATIONS .
Página 26
... elevation of A above mean tide should be ascertained . It is to be regretted that this was not done from the outset , 2.22 2.64 10.81 8.4 2 3.7 3.2 10.36 under statute provisions requiring maps and profiles also to be filed at the ...
... elevation of A above mean tide should be ascertained . It is to be regretted that this was not done from the outset , 2.22 2.64 10.81 8.4 2 3.7 3.2 10.36 under statute provisions requiring maps and profiles also to be filed at the ...
Página 27
... elevation of the initial bench - mark , A , in the figure , be taken at +200 . Set the level at B , and suppose the rod on the BM to read 2.22 . The " instrument height " then is 202.22 . If the rod at sta . O reads 8.4 , the elevation ...
... elevation of the initial bench - mark , A , in the figure , be taken at +200 . Set the level at B , and suppose the rod on the BM to read 2.22 . The " instrument height " then is 202.22 . If the rod at sta . O reads 8.4 , the elevation ...
Página 28
... elevations rapidly , and , when necessary , to d his work with the aid of an unlettered rodman . 9. CORRECTION FOR ... elevation , in the case of a long unbalanced sight . It varies as the square of the distance . Calling the required ...
... elevations rapidly , and , when necessary , to d his work with the aid of an unlettered rodman . 9. CORRECTION FOR ... elevation , in the case of a long unbalanced sight . It varies as the square of the distance . Calling the required ...
Página 29
... ELEVATION BY MEANS OF THE BAROMETER . Call the required difference D ; the barometrical reading at the lower stand , L ; that at the upper stand , U. Then , D = ( L− U ) ÷ ( L + U ) × 55000 . L = 26.64 ; U = 20.82 . Then , L - U = 5.82 ...
... ELEVATION BY MEANS OF THE BAROMETER . Call the required difference D ; the barometrical reading at the lower stand , L ; that at the upper stand , U. Then , D = ( L− U ) ÷ ( L + U ) × 55000 . L = 26.64 ; U = 20.82 . Then , L - U = 5.82 ...
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,...