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 x
... direction . P. R. C. Point of reverse curvature : the stake - mark where a curve merges in another turning in the opposite direction . B. S. Backsight , in transit work ; or the reading of the rod to ascertain the instrument height in ...
... direction . P. R. C. Point of reverse curvature : the stake - mark where a curve merges in another turning in the opposite direction . B. S. Backsight , in transit work ; or the reading of the rod to ascertain the instrument height in ...
Página 23
... direction which would seem to increase the error requiring correction . 3. Before beginning the adjustments , screw the object - glass close home , and make a pin - scratch across its rim and the end of the tube , by which to mark its ...
... direction which would seem to increase the error requiring correction . 3. Before beginning the adjustments , screw the object - glass close home , and make a pin - scratch across its rim and the end of the tube , by which to mark its ...
Página 28
... direction of the instrument to make sure of getting the full height . In foul weather the rodman should take care that the foot of the rod does not ball up with mud or snow . The leveller should have his cross - hairs free from parallax ...
... direction of the instrument to make sure of getting the full height . In foul weather the rodman should take care that the foot of the rod does not ball up with mud or snow . The leveller should have his cross - hairs free from parallax ...
Página 40
... direction . Unclamp . Re- volve the instrument horizontally on its spindle half way round , and direct the cross - hair to the point first observed . Again upset the telescope . If the cross - hair now strikes aside from the second mark ...
... direction . Unclamp . Re- volve the instrument horizontally on its spindle half way round , and direct the cross - hair to the point first observed . Again upset the telescope . If the cross - hair now strikes aside from the second mark ...
Página 79
... directions , and , aided by the best attainable maps , qualify himself by actual observation to in- struct his assistants as to the conduct of the survey . Equipped with hand - level , pocket - compass , and in rough regions with the ...
... directions , and , aided by the best attainable maps , qualify himself by actual observation to in- struct his assistants as to the conduct of the survey . Equipped with hand - level , pocket - compass , and in rough regions with the ...
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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