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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... instrument height in levelling . F. S. Foresight , in transit work ; or the reading of the rod to ascertain elevations in levelling . H. I. Height of instrument : elevation of the level above the datum or zero plane . H. W. High water ...
... instrument height in levelling . F. S. Foresight , in transit work ; or the reading of the rod to ascertain elevations in levelling . H. I. Height of instrument : elevation of the level above the datum or zero plane . H. W. High water ...
Página 27
... 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 ... instrument to C , and , sighting back to sta . 2 , let the rod standing on the pin read 2.64 . This makes the new ...
... 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 ... instrument to C , and , sighting back to sta . 2 , let the rod standing on the pin read 2.64 . This makes the new ...
Página 28
... 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 , the tar- get ...
... 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 , the tar- get ...
Página 29
... instrument at that dis- tance would really be 60 feet above it . Transposing ... height . If not so differ- enced , questions of detour , of approaches , and ... height of place of observation above or place of observation . LEVELLING . 29 22.
... instrument at that dis- tance would really be 60 feet above it . Transposing ... height . If not so differ- enced , questions of detour , of approaches , and ... height of place of observation above or place of observation . LEVELLING . 29 22.
Página 31
... Instrument height , in the example treated , being by either method fixed at 15.5 above grade , the next step is a guess how far out from the centre stake the formation slope would proba- bly meet the ground surface . The closeness of ...
... Instrument height , in the example treated , being by either method fixed at 15.5 above grade , the next step is a guess how far out from the centre stake the formation slope would proba- bly meet the ground surface . The closeness of ...
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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