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 26
... Suppose O the starting - point ; 1 , 2 , 3 , & c . , the stakes of survey ; and A the initial bench - mark . Wherever convenient the elevation of A above mean tide should be ascertained . It is to be regretted that this was not done ...
... Suppose O the starting - point ; 1 , 2 , 3 , & c . , the stakes of survey ; and A the initial bench - mark . Wherever convenient the elevation of A above mean tide should be ascertained . It is to be regretted that this was not done ...
Página 27
... suppose the rod on the BM to read 2.22 . The " instrument height " then is 202.22 . If the rod at sta . O reads 8.4 , the elevation at that point is 202.22 8.4 = 193.8 . The rod reading 1.9 at sta . 1 , the elevation there is 202.2 ...
... suppose the rod on the BM to read 2.22 . The " instrument height " then is 202.22 . If the rod at sta . O reads 8.4 , the elevation at that point is 202.22 8.4 = 193.8 . The rod reading 1.9 at sta . 1 , the elevation there is 202.2 ...
Página 31
... suppose , the lower slope , and to ascertain its height above grade at the proposed section . This is usually done by refer- ence to the nearest bench , and pegging from stake to stake as the work progresses . Unless the ground is very ...
... suppose , the lower slope , and to ascertain its height above grade at the proposed section . This is usually done by refer- ence to the nearest bench , and pegging from stake to stake as the work progresses . Unless the ground is very ...
Página 32
... Suppose him , by either method , or even by random guess , to think that 10 feet for half the road - bed , and 10 more for the slope , looks about right . The formation slope being 1 to 1 , this implies a cutting of 10 feet at the side ...
... Suppose him , by either method , or even by random guess , to think that 10 feet for half the road - bed , and 10 more for the slope , looks about right . The formation slope being 1 to 1 , this implies a cutting of 10 feet at the side ...
Página 33
... suppose the level at B , 25.5 feet above grade , com- manding the upper slope . Note the change of ground 11 feet out , and take a rod there , recording the observation . The cutting at that point is 25.5 9.5 - - = = 16 feet ...
... suppose the level at B , 25.5 feet above grade , com- manding the upper slope . Note the change of ground 11 feet out , and take a rod there , recording the observation . The cutting at that point is 25.5 9.5 - - = = 16 feet ...
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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