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 42
... circle of the instrument , by means of which subdivisions of the circle graduation can be read . There are many varieties of the ver- nier ; but a knowledge of the principle upon which one is made introduces the student to an easy ...
... circle of the instrument , by means of which subdivisions of the circle graduation can be read . There are many varieties of the ver- nier ; but a knowledge of the principle upon which one is made introduces the student to an easy ...
Página 43
... 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 from zero each way on the ver- nier , and there ...
... 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 from zero each way on the ver- nier , and there ...
Página 45
... circle . It is therefore due north of an observer only when verti- cally above or below the pole . To observe it at either of these points , reference is had to certain bright stars which are in vertical range with it near the time of ...
... circle . It is therefore due north of an observer only when verti- cally above or below the pole . To observe it at either of these points , reference is had to certain bright stars which are in vertical range with it near the time of ...
Página 47
... , bisecting the angle between the northern range marks . With a vernier instrument , the azimuth can be laid off directly , in degrees and minutes . PROPOSITIONS AND PROBLEMS RELATING TO THE CIRCLE . XVI . MISCELLANEOUS . 47.
... , bisecting the angle between the northern range marks . With a vernier instrument , the azimuth can be laid off directly , in degrees and minutes . PROPOSITIONS AND PROBLEMS RELATING TO THE CIRCLE . XVI . MISCELLANEOUS . 47.
Página 49
... CIRCLE . XVI . PROPOSITIONS RELATING TO THE CIRCLE . The following propositions , demonstrable by simple processes of geometrical reasoning , may be regarded as axiomatic . B I H E N 1. In any circle a tangent is perpendicular to radius ...
... CIRCLE . XVI . PROPOSITIONS RELATING TO THE CIRCLE . The following propositions , demonstrable by simple processes of geometrical reasoning , may be regarded as axiomatic . B I H E N 1. In any circle a tangent is perpendicular to radius ...
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,...