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 36
... curve extending 150 feet each way . A circular arc consuming so small an angle may be treated as a parabola , in which the external secant BF is equal to the versed sine F D. Referring to the above diagram , ordinates 4 and 8 will be ...
... curve extending 150 feet each way . A circular arc consuming so small an angle may be treated as a parabola , in which the external secant BF is equal to the versed sine F D. Referring to the above diagram , ordinates 4 and 8 will be ...
Página 38
... curve will be : -- 94.0 94.46 94.82 95.11 95.30 95.41 95,42 95.36 95.2 Example 3 . Elevation at A = +94.0 ; A B + 1 ... 4 . Elevation at A + 94.0 ; AB 94.0 94.47 94.87 95.22 95,5 95.72 95.87 95.97 96.0 38 VERTICAL CURVES .
... curve will be : -- 94.0 94.46 94.82 95.11 95.30 95.41 95,42 95.36 95.2 Example 3 . Elevation at A = +94.0 ; A B + 1 ... 4 . Elevation at A + 94.0 ; AB 94.0 94.47 94.87 95.22 95,5 95.72 95.87 95.97 96.0 38 VERTICAL CURVES .
Página 39
... 4 8 C 92.75 92.5 A 8 4 94.0 93.75 93.5 93.25 93.0 From which deduct the ordinates just found , 0.0 0.21 0.33 0.37 0.33 0.21 0.0 And the grade elevations on the curve will be : - 94.0 93.54 93.17 92.88 92.67 92.54 92.5 The figures are ...
... 4 8 C 92.75 92.5 A 8 4 94.0 93.75 93.5 93.25 93.0 From which deduct the ordinates just found , 0.0 0.21 0.33 0.37 0.33 0.21 0.0 And the grade elevations on the curve will be : - 94.0 93.54 93.17 92.88 92.67 92.54 92.5 The figures are ...
Página 52
... 4 , angle D AB = DBA = AGD = DGB = } I. 3. GIVEN THE INTERSECTION ANGLE I AND RADIUS R , TO FIND THE APEX DIST . A D. AD RX tan . I. = R = 1,910.1 , I = 35 ° 24 ' . Example . Then ADR tan . I = 1,910.1 × 0.3191 ... RADIUS OF A CURVE ,
... 4 , angle D AB = DBA = AGD = DGB = } I. 3. GIVEN THE INTERSECTION ANGLE I AND RADIUS R , TO FIND THE APEX DIST . A D. AD RX tan . I. = R = 1,910.1 , I = 35 ° 24 ' . Example . Then ADR tan . I = 1,910.1 × 0.3191 ... RADIUS OF A CURVE ,
Página 53
... ( 4 ) , R = ADXM K ÷ D K. 7. If 100 - feet chords be used , find in Table XVI . the ap . dist . corresponding to the given angle I. Divide that tabular datum by the given ap . dist .; the quotient will be the degree of curvature ... RADIUS OF A ...
... ( 4 ) , R = ADXM K ÷ D K. 7. If 100 - feet chords be used , find in Table XVI . the ap . dist . corresponding to the given angle I. Divide that tabular datum by the given ap . dist .; the quotient will be the degree of curvature ... RADIUS OF A ...
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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