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 25
... rude device . With so short a leverage as the length of the common adjust- manageable motion . They reproach the instrument - maker's art ing - pin supplies , it is almost impossible to give them a smooth , THE LEVEL . 25.
... rude device . With so short a leverage as the length of the common adjust- manageable motion . They reproach the instrument - maker's art ing - pin supplies , it is almost impossible to give them a smooth , THE LEVEL . 25.
Página 42
... length to nine of these parts is divided also into ten equal parts . The sub- divisions of the latter scale will then each be nine - tenths as large as the subdivisions of the former ; and if the graduated edges are placed together ...
... length to nine of these parts is divided also into ten equal parts . The sub- divisions of the latter scale will then each be nine - tenths as large as the subdivisions of the former ; and if the graduated edges are placed together ...
Página 51
... length from the arc subtended by it , the bow being more and more arched in relation to the string . Thus , in the circle having a radius equal to one - twentieth of the primary radius , the chord 100 feet long subtends an angle of 20 ...
... length from the arc subtended by it , the bow being more and more arched in relation to the string . Thus , in the circle having a radius equal to one - twentieth of the primary radius , the chord 100 feet long subtends an angle of 20 ...
Página 52
... LENGTH , THE DEGREE , ETC. , OF A CURVE . 1. Let DB , A L be two straight lines intersecting at D. Lay off equal distances , D A , D B ; erect perpendiculars at A and L M K H B N and G A or G B , the radius , R. chord of 100 feet D , as ...
... LENGTH , THE DEGREE , ETC. , OF A CURVE . 1. Let DB , A L be two straight lines intersecting at D. Lay off equal distances , D A , D B ; erect perpendiculars at A and L M K H B N and G A or G B , the radius , R. chord of 100 feet D , as ...
Página 54
... LENGTH OF THE LONG CHORD C , THE MIDDLE ORD . O , THE EXTERNAL SECANT S , OR THE APEX 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 ...
... LENGTH OF THE LONG CHORD C , THE MIDDLE ORD . O , THE EXTERNAL SECANT S , OR THE APEX 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 ...
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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