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 41
... range being readily found . 5. Having thus brought the cross - hair to revolve in a plane , it is next to be seen whether the plane in which it revolves is truly vertical . To do so , set the instrument near the base of some lofty point ...
... range being readily found . 5. Having thus brought the cross - hair to revolve in a plane , it is next to be seen whether the plane in which it revolves is truly vertical . To do so , set the instrument near the base of some lofty point ...
Página 45
... range with it near the time of culmina- tion . Its vertical range with either of the reference stars being ob- served , the true meridian may be set out by means of a direct obser- vation of Polaris at an interval of time thereafter ...
... range with it near the time of culmina- tion . Its vertical range with either of the reference stars being ob- served , the true meridian may be set out by means of a direct obser- vation of Polaris at an interval of time thereafter ...
Página 46
... range with Polaris by shifting the observation point laterally . That range will be the true meridian . Stakes may be set on it forthwith by means of candles . If the star in Cassiopeia be used within the coming two and a half years ...
... range with Polaris by shifting the observation point laterally . That range will be the true meridian . Stakes may be set on it forthwith by means of candles . If the star in Cassiopeia be used within the coming two and a half years ...
Página 47
... range just set . The product will be the dis- tance from said northern range mark , square right or left , to a point in the true meridian passing through the point of ob- servation . If the western elongation was observed , set off the ...
... range just set . The product will be the dis- tance from said northern range mark , square right or left , to a point in the true meridian passing through the point of ob- servation . If the western elongation was observed , set off the ...
Página 65
... range C T. The point D on the curve may then be fixed by making ND equal to 5.95 feet , the tangential distance . Next run out the chain to M , in the range CD ; make ME equal to the deflection distance , 11.9 feet , and fix the point E ...
... range C T. The point D on the curve may then be fixed by making ND equal to 5.95 feet , the tangential distance . Next run out the chain to M , in the range CD ; make ME equal to the deflection distance , 11.9 feet , and fix the point E ...
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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