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
Resultados 1-5 de 11
Página 39
... 50 feet to an inch horizontal . By means of the curve protractor ( Art . XXV . 1 ) a suitable arc may XIV . THE TRANSIT . - 1. Should the vernier then be fitted and struck in , and the elevations read off . VERTICAL CURVES . 39.
... 50 feet to an inch horizontal . By means of the curve protractor ( Art . XXV . 1 ) a suitable arc may XIV . THE TRANSIT . - 1. Should the vernier then be fitted and struck in , and the elevations read off . VERTICAL CURVES . 39.
Página 40
... vernier and circle plates be out of parallel , should one or the other be sprung , a defect shown by a slight rocking motion when the rims are pinched alternately on op- posite sides , the instrument must be sent to the shop for repair ...
... vernier and circle plates be out of parallel , should one or the other be sprung , a defect shown by a slight rocking motion when the rims are pinched alternately on op- posite sides , the instrument must be sent to the shop for repair ...
Página 42
... VERNIER . 1. The vernier in the transit is a short graduated arc , movable around the graduated circle of the instrument , by means of which subdivisions of the circle graduation can be read . There are many varieties of the ver- nier ...
... VERNIER . 1. The vernier in the transit is a short graduated arc , movable around the graduated circle of the instrument , by means of which subdivisions of the circle graduation can be read . There are many varieties of the ver- nier ...
Página 43
... vernier , together with a part of the graduated circle . The vernier is a double one , for con- venience in reading angles right or left . It will be observed that a space , equal to twenty - nine half degrees on the limb , is laid off ...
... vernier , together with a part of the graduated circle . The vernier is a double one , for con- venience in reading angles right or left . It will be observed that a space , equal to twenty - nine half degrees on the limb , is laid off ...
Página 44
... vernier to the angle already ascertained within half a degree from the limb : the sum will be the angle sought . The vernier in the figure reads 1 ° 20 ' L. 5. In some respects a vernier graduated decimally would be more convenient on ...
... vernier to the angle already ascertained within half a degree from the limb : the sum will be the angle sought . The vernier in the figure reads 1 ° 20 ' L. 5. In some respects a vernier graduated decimally would be more convenient on ...
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,...