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 3
... decimal . If a number lies between 10 and 100 , its logarithm is equal to 1 plus a decimal ; and so on . 3. The characteristic of the logarithm of a decimal fraction is negative , and numerically 1 greater than the number of O's that ...
... decimal . If a number lies between 10 and 100 , its logarithm is equal to 1 plus a decimal ; and so on . 3. The characteristic of the logarithm of a decimal fraction is negative , and numerically 1 greater than the number of O's that ...
Página 5
... decimal point after the fourth figure , thus converting the number into a mixed number . Find the mantissa of the entire part by the method last given . Then take from column D the correspond- ing tabular difference , multiply this by ...
... decimal point after the fourth figure , thus converting the number into a mixed number . Find the mantissa of the entire part by the method last given . Then take from column D the correspond- ing tabular difference , multiply this by ...
Página 53
... decimals . The radius corre- sponding to this degree of curvature may be found by ( 12 ) , by Table X. , or , with sufficient accuracy for ordinary practice , by dividing 5,730 , the radius of a 1 ° curve , by it . Thus , in the ...
... decimals . The radius corre- sponding to this degree of curvature may be found by ( 12 ) , by Table X. , or , with sufficient accuracy for ordinary practice , by dividing 5,730 , the radius of a 1 ° curve , by it . Thus , in the ...
Página 55
... decimals . Example 1 . Given A D = 587 , I = 22 ° 26 ' ; to find D. The A D corresponding to I in Table XVI . is 1,136.3 . Then 1,136.3 ÷ 587 = = 1.935 = 1 ° 56 ' : = D. Example 2 . Given S = 64 , I = 30 ° 25 ' , to find D. The Ex . Sec ...
... decimals . Example 1 . Given A D = 587 , I = 22 ° 26 ' ; to find D. The A D corresponding to I in Table XVI . is 1,136.3 . Then 1,136.3 ÷ 587 = = 1.935 = 1 ° 56 ' : = D. Example 2 . Given S = 64 , I = 30 ° 25 ' , to find D. The Ex . Sec ...
Página 56
... decimals of a degree ; then divide by the degree of curvature . I - Example 1 . 20 ° 40 ′ , D = 3 ° . 20 ° 40 ' is equivalent to 20.67 degrees . Dividing by 3 , we have 6.89 chord lengths for the length of the curve . If the chords , as ...
... decimals of a degree ; then divide by the degree of curvature . I - Example 1 . 20 ° 40 ′ , D = 3 ° . 20 ° 40 ' is equivalent to 20.67 degrees . Dividing by 3 , we have 6.89 chord lengths for the length of the curve . If the chords , as ...
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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