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 viii
... limited ability . Thus good turns go round , and we civilize by mutual service . HARRISBURG , PA . , March , 1890 . W. F. S. ABBREVIATIONS . + Increased by . Diminished by . × viii PREFACE . Inches reduced to decimal parts of a foot 153.
... limited ability . Thus good turns go round , and we civilize by mutual service . HARRISBURG , PA . , March , 1890 . W. F. S. ABBREVIATIONS . + Increased by . Diminished by . × viii PREFACE . Inches reduced to decimal parts of a foot 153.
Página 11
... foot of the sine and the ex- tremity of the enclosing arc . The cotangent of an angle is the tangent of the complement of that angle : the co - versed sine and cosecant are similarly defined . Thus BT ' , BN , and OT are respectively ...
... foot of the sine and the ex- tremity of the enclosing arc . The cotangent of an angle is the tangent of the complement of that angle : the co - versed sine and cosecant are similarly defined . Thus BT ' , BN , and OT are respectively ...
Página 28
... foot of the rod does not ball up with mud or snow . The leveller should have his cross - hairs free from parallax , the tar- get in focus , and see his bubble true at the moment of obser- vation . He should also set the instrument about ...
... foot of the rod does not ball up with mud or snow . The leveller should have his cross - hairs free from parallax , the tar- get in focus , and see his bubble true at the moment of obser- vation . He should also set the instrument about ...
Página 30
... foot vertical . The carriages of a stairway with twelve - inch treads and eight - inch risers would have a slope of " 1 to 1. " 66 3. To fix the point where any proposed formation slope must meet the surface on level ground , is quite ...
... foot vertical . The carriages of a stairway with twelve - inch treads and eight - inch risers would have a slope of " 1 to 1. " 66 3. To fix the point where any proposed formation slope must meet the surface on level ground , is quite ...
Página 33
... foot below grade , -30.0-- -25 : 0 --23.5- 22 : 6 > $ 3.2 a bdc < 12.7 and that , therefore , 1.0 is to be added to all rods , in order to find the height of embankment above the points at which rods are taken . 14. Consider the down ...
... foot below grade , -30.0-- -25 : 0 --23.5- 22 : 6 > $ 3.2 a bdc < 12.7 and that , therefore , 1.0 is to be added to all rods , in order to find the height of embankment above the points at which rods are taken . 14. Consider the down ...
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,...