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
... PARALLEL WITH THE TELE- SCOPE AXIS . 5. Clamp the instrument over either pair of levelling screws , and bring the bubble to the middle of its tube . Turn the tele- scope slightly on its bearings , so that the bubble - case shall project ...
... PARALLEL WITH THE TELE- SCOPE AXIS . 5. Clamp the instrument over either pair of levelling screws , and bring the bubble to the middle of its tube . Turn the tele- scope slightly on its bearings , so that the bubble - case shall project ...
Página 40
... parallel , should one or the other be sprung , a defect shown by a slight rocking motion when the rims are pinched alternately on op- posite sides , - the instrument must be sent to the shop for · repair . This is a common disease of ...
... parallel , should one or the other be sprung , a defect shown by a slight rocking motion when the rims are pinched alternately on op- posite sides , - the instrument must be sent to the shop for · repair . This is a common disease of ...
Página 73
... parallel to A B. Let lines BC , CE , FG , cut these parallels at equal inclinations . Call this angle I. Then BC СЕ = = FG . BE = BD + DE But BD - = 2 BD . C : BC cos . I , .. BE 2 BC cos . I. EG = CF. BG = EG + BECF + 2 BC cos . I ...
... parallel to A B. Let lines BC , CE , FG , cut these parallels at equal inclinations . Call this angle I. Then BC СЕ = = FG . BE = BD + DE But BD - = 2 BD . C : BC cos . I , .. BE 2 BC cos . I. EG = CF. BG = EG + BECF + 2 BC cos . I ...
Página 75
... parallel to AB . Mark on it the point G in range with D and E. Then GF BE , or G H = CE . = 5. Should the use of a right angle be inconvenient , turn any angle EBD = x , measure BD about equal by estimation to BE , if the ground permits ...
... parallel to AB . Mark on it the point G in range with D and E. Then GF BE , or G H = CE . = 5. Should the use of a right angle be inconvenient , turn any angle EBD = x , measure BD about equal by estimation to BE , if the ground permits ...
Página 96
... parallel to BE . It is plain , from the diagram , that if the curve and its initial tangent be moved forward , like the blade of a skate , until the terminal tangent merges in D F , the P. T. will have traversed the line BD , equal and ...
... parallel to BE . It is plain , from the diagram , that if the curve and its initial tangent be moved forward , like the blade of a skate , until the terminal tangent merges in D F , the P. T. will have traversed the line BD , equal and ...
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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