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, and Prepared with Special Reference to the Wants of the Young EngineerD. Van Nostrand Company, 1890 - 339 páginas |
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Página 50
... angle DIE , at the intersection of tangents , is equal to the central angle BC E , included between radii to the tan- gent points . 4. If a chord BE connect the tangent points , the angles IBE , IEB , are equal : each of them is equal ...
... angle DIE , at the intersection of tangents , is equal to the central angle BC E , included between radii to the tan- gent points . 4. If a chord BE connect the tangent points , the angles IBE , IEB , are equal : each of them is equal ...
Página 51
... angle of two degrees at the centre . Such an arc is called a two - degree curve . If one - third of the primary ... central angle per 100 feet chord , varies . XVIII . TO FIND THE RADIUS , THE APEX DISTANCE CIRCULAR CURVES ON RAILROADS . 51.
... angle of two degrees at the centre . Such an arc is called a two - degree curve . If one - third of the primary ... central angle per 100 feet chord , varies . XVIII . TO FIND THE RADIUS , THE APEX DISTANCE CIRCULAR CURVES ON RAILROADS . 51.
Página 59
... Angle HAN = † HGB ; HG B = AGB , .. HAN = AGB . = HN = AN X tan . HAN ; i.e. , M being the central angle subtended by the chord . CX tan . D ; D Example . D = 7 ° , C = 100 ; to find M , the middle ordinate . M = } C × tan . † D = 50 ...
... Angle HAN = † HGB ; HG B = AGB , .. HAN = AGB . = HN = AN X tan . HAN ; i.e. , M being the central angle subtended by the chord . CX tan . D ; D Example . D = 7 ° , C = 100 ; to find M , the middle ordinate . M = } C × tan . † D = 50 ...
Página 64
... angle , corresponding to an angle of 5 ° 10 ′ : the de- flection angle , therefore , is 10 ° 20 ' . The tangential ... central angle by the degree of curvature . The central angle , 34 ° 27 ′ , is equivalent to 2067 minutes ; dividing by ...
... angle , corresponding to an angle of 5 ° 10 ′ : the de- flection angle , therefore , is 10 ° 20 ' . The tangential ... central angle by the degree of curvature . The central angle , 34 ° 27 ′ , is equivalent to 2067 minutes ; dividing by ...
Página 71
... central angle due to the length of curve to that point ; and at the P. T. that number must correspond with the total central angle . The work can thus be checked with facility during its progress , and checks itself at the end . 18. The ...
... central angle due to the length of curve to that point ; and at the P. T. that number must correspond with the total central angle . The work can thus be checked with facility during its progress , and checks itself at the end . 18. The ...
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Términos y frases comunes
A. D. MIN adjustment apex distance backsight called central angle CHORD column Cosine 1 Sine cross-hair Cube Roots decimal deflection distance degree of curvature degree of curve Diff divided engineer equal error Example feet figure fixed FOOD foregoing formation slope frog angle gauge of track gauge side ground Hence inches index angle instrument height intersection angle located logarithm Main frog dist mantissa mark measure method metres metric curve middle frog middle ordinate middle point minutes multiplied natural sine number corresponding observation opposite outer rail parallel perpendicular plane triangle Polaris quotient radii radius range REVERSED CURVE rule Sine 1 Cotang Square Roots sub-chord subtended Subtract Suppose switch-rail Table XVI tabular tance Tang tangential angle tangential distance telescope terminal tangent tion toe of switch transitman Trigonometry turnout curve vernier vertical ΙΟ