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 52
... DIST . A D. AD RX tan . I. = R = 1,910.1 , I = 35 ° 24 ' . Example . Then ADR tan . I = 1,910.1 × 0.3191 = 609.5 . 4. Measure from the P. I. equal distances , DM , D F , along the tangents . Measure , also , M F and D K , the distance ...
... DIST . A D. AD RX tan . I. = R = 1,910.1 , I = 35 ° 24 ' . Example . Then ADR tan . I = 1,910.1 × 0.3191 = 609.5 . 4. Measure from the P. I. equal distances , DM , D F , along the tangents . Measure , also , M F and D K , the distance ...
Página 53
... dist . in Table XVI . corresponding to the given angle I. Divide that tabular ap . dist . by the degree of curvature corresponding to the given radius : the quotient will be the required ap . dist . Thus , Tab . A D corresponding to 35 ...
... dist . in Table XVI . corresponding to the given angle I. Divide that tabular ap . dist . by the degree of curvature corresponding to the given radius : the quotient will be the required ap . dist . Thus , Tab . A D corresponding to 35 ...
Página 54
... DIST . A D. Take from the proper column in Table XVI . , the number corresponding to the intersection angle , and divide it by the degree of curvature : the quotient will be the length required . Example . A 4 ° curve , I = 50 ° 16 ...
... DIST . A D. Take from the proper column in Table XVI . , the number corresponding to the intersection angle , and divide it by the degree of curvature : the quotient will be the length required . Example . A 4 ° curve , I = 50 ° 16 ...
Página 67
... dist . corresponding to 66 ° 45 ' is found by inter- polation to be 3774.6 ; dividing by 7.5 , the rate of curvature in degrees and decimals , we have for the apex distance 503 feet , as above . 3. Before disturbing the instrument ...
... dist . corresponding to 66 ° 45 ' is found by inter- polation to be 3774.6 ; dividing by 7.5 , the rate of curvature in degrees and decimals , we have for the apex distance 503 feet , as above . 3. Before disturbing the instrument ...
Página 69
... P. T. , = the total angle consumed by the curve . The work thus proves itself . 16. The preceding example would appear in the field - book as follows : - = DIST . DEF . INDEX . TANG . COURSE . TO TRACE A CURVE ON THE GROUND . 69.
... P. T. , = the total angle consumed by the curve . The work thus proves itself . 16. The preceding example would appear in the field - book as follows : - = DIST . DEF . INDEX . TANG . COURSE . TO TRACE A CURVE ON THE GROUND . 69.
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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