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 130
... frog point O , S. The angle NOL or NLO , be- half the intersection angle HNW NOP NII W = = F - tween chord and ... middle frog at I. IE - IPPE or OK ; i.e. , R cos . F ' = Hence nat . cos . F ' = nat . cos . F + ( † G ÷ R ) . = G + R cos ...
... frog point O , S. The angle NOL or NLO , be- half the intersection angle HNW NOP NII W = = F - tween chord and ... middle frog at I. IE - IPPE or OK ; i.e. , R cos . F ' = Hence nat . cos . F ' = nat . cos . F + ( † G ÷ R ) . = G + R cos ...
Página 131
... frog angle . 13. To find the Angle of the Middle Frog , in the Case of a Double Turnout . Call the natural cosine of the main frog angle a . Divide half the gauge of track by the radius of outer rail of turnout curve ; call the quotient ...
... frog angle . 13. To find the Angle of the Middle Frog , in the Case of a Double Turnout . Call the natural cosine of the main frog angle a . Divide half the gauge of track by the radius of outer rail of turnout curve ; call the quotient ...
Página 132
... middle frog = 2 F / = 7 ° 57 ' . - LI = ( † G — D ) ÷ sin . † ( F ' + S ) = ( 2.354 — 0.42 ) ÷ sin . ( 3 ° 58'1 ° 20 ' ) = 1.934 0.0463 41.8 feet . 17. In ordinary practice , frogs may be located with sufficient exactness by the ...
... middle frog = 2 F / = 7 ° 57 ' . - LI = ( † G — D ) ÷ sin . † ( F ' + S ) = ( 2.354 — 0.42 ) ÷ sin . ( 3 ° 58'1 ° 20 ' ) = 1.934 0.0463 41.8 feet . 17. In ordinary practice , frogs may be located with sufficient exactness by the ...
Página 134
... frog patterns are enough for general service . They should be so proportioned , that , taken in couples , the less may fit as middle frogs on double turnouts . Numbers 54 , 71 , and 10 make an excellent suit ; numbers 5 , 7 , and 9 also ...
... frog patterns are enough for general service . They should be so proportioned , that , taken in couples , the less may fit as middle frogs on double turnouts . Numbers 54 , 71 , and 10 make an excellent suit ; numbers 5 , 7 , and 9 also ...
Página 135
... frog dist . Switch - rail , 12 ft Rad . outer rail . Do.angle , 2 ° 00 / Mid . frog dist . Mid . frog angle . 4 20 121 1123-101 5 6 61 7 14 ° 20 / 12 ° 44 / 11 ° 28 / 10 ° 21 / 9 ° 33 ′ 8 ° 52 ′ 8 ° 11 / 71 8 81 9 91 10 11 10 7 ° 41 ′ 7 ...
... frog dist . Switch - rail , 12 ft Rad . outer rail . Do.angle , 2 ° 00 / Mid . frog dist . Mid . frog angle . 4 20 121 1123-101 5 6 61 7 14 ° 20 / 12 ° 44 / 11 ° 28 / 10 ° 21 / 9 ° 33 ′ 8 ° 52 ′ 8 ° 11 / 71 8 81 9 91 10 11 10 7 ° 41 ′ 7 ...
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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