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 27
... ground on the contemplated line . 3. Let the 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 ...
... ground on the contemplated line . 3. Let the 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 ...
Página 28
... ground . ought not to be more than 600 or 800 feet asunder . 7. On ordinary railroad field work such nicety as is implied in most of these rules is not required . To read to the nearest tenth is sufficient , especially where the ...
... ground . ought not to be more than 600 or 800 feet asunder . 7. On ordinary railroad field work such nicety as is implied in most of these rules is not required . To read to the nearest tenth is sufficient , especially where the ...
Página 29
... ground to be occupied , and can decide between summits well differenced in height . If not so differ- enced , questions of detour , of approaches , and the like , will contribute to determine the expediency of making an instru- mental ...
... ground to be occupied , and can decide between summits well differenced in height . If not so differ- enced , questions of detour , of approaches , and the like , will contribute to determine the expediency of making an instru- mental ...
Página 30
... ground surface . Formation slopes are usually stated in parts horizontal to one part vertical . Thus a slope of 45 ° is " 1 to 1. " A slope of " 2 to 1 " has a horizontal reach of two feet to each foot vertical . The carriages of a ...
... ground surface . Formation slopes are usually stated in parts horizontal to one part vertical . Thus a slope of 45 ° is " 1 to 1. " A slope of " 2 to 1 " has a horizontal reach of two feet to each foot vertical . The carriages of a ...
Página 31
... ground is very steep , and the slope - stakes largely different in elevation , labor will be saved and likelihood of error reduced by levelling over the centre line beforehand , as a separate job , and marking on centre stakes the cuts ...
... ground is very steep , and the slope - stakes largely different in elevation , labor will be saved and likelihood of error reduced by levelling over the centre line beforehand , as a separate job , and marking on centre stakes the cuts ...
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 decimal deflection distance degree of curvature degree of curve Diff divided elevation equal equivalent Example figure Find the logarithm fixed foregoing formation slope frog angle gauge of track gauge side given angle grade ground inches index angle instrument height intersection angle located logarithm Main frog dist mantissa mark measure method metres middle ordinate minutes multiply number corresponding observation opposite outer rail parallel perpendicular plane triangle quotient radii radius REVERSED CURVE rithm 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 2 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Página 2 - 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 11 - 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 15 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Página 1 - 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 13 - 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 13 - 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 11 - 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 13 - 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 9 - 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,...