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 129
... outer rail , R. 2. Usually the length and throw of switch - rail and the angles of the frogs at O are given . In that case , to find R , F ' , and the distances LO , LI , reason thus : = 3. The angle HN W , between the line -- - FROGS ...
... outer rail , R. 2. Usually the length and throw of switch - rail and the angles of the frogs at O are given . In that case , to find R , F ' , and the distances LO , LI , reason thus : = 3. The angle HN W , between the line -- - FROGS ...
Página 130
... rail pro- longed and a tangent to turnout curve at frog point O , S. The angle NOL or NLO , be- half the intersection angle HNW NOP NII W = = F - tween chord and tangent , = } ( F ... Outer Rail of Turnout sought . 130 FROGS AND SWITCHES .
... rail pro- longed and a tangent to turnout curve at frog point O , S. The angle NOL or NLO , be- half the intersection angle HNW NOP NII W = = F - tween chord and tangent , = } ( F ... Outer Rail of Turnout sought . 130 FROGS AND SWITCHES .
Página 131
... Outer Rail being known . Subtract Call the natural cosine of the switch - rail angle a . the throw of switch - rail from the gauge of track , both in deci- mals . Divide the remainder by radius ; call the quotient b . Subtract b from a ...
... Outer Rail being known . Subtract Call the natural cosine of the switch - rail angle a . the throw of switch - rail from the gauge of track , both in deci- mals . Divide the remainder by radius ; call the quotient b . Subtract b from a ...
Página 132
... rail in feet ; F the distance from toe of outer switch - rail to point of frog in feet . Then , for standard gauge , 4 feet 8 inches , straight switch- rail , and 5 inches throw of switch . F = 8.6 L N L + 0.42 N The above may be ...
... rail in feet ; F the distance from toe of outer switch - rail to point of frog in feet . Then , for standard gauge , 4 feet 8 inches , straight switch- rail , and 5 inches throw of switch . F = 8.6 L N L + 0.42 N The above may be ...
Página 133
... rail in feet and four - fifths of the frog number ; call the sum B. Then divide A by B , and the quotient will be the distance from toe of outer switch - rail to point of frog in feet . 20. The foregoing rules are applicable to turnouts ...
... rail in feet and four - fifths of the frog number ; call the sum B. Then divide A by B , and the quotient will be the distance from toe of outer switch - rail to point of frog in feet . 20. The foregoing rules are applicable to turnouts ...
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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