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 39
... 50 feet to an inch horizontal . By means of the curve protractor ( Art . XXV . 1 ) a suitable arc may XIV . THE TRANSIT . - 1. Should the vernier then be fitted and struck in , and the elevations read off . VERTICAL CURVES . 39.
... 50 feet to an inch horizontal . By means of the curve protractor ( Art . XXV . 1 ) a suitable arc may XIV . THE TRANSIT . - 1. Should the vernier then be fitted and struck in , and the elevations read off . VERTICAL CURVES . 39.
Página 40
... vernier and circle plates be out 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 ...
... vernier and circle plates be out 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 ...
Página 42
... VERNIER . 1. The vernier in the transit is a short graduated arc , movable around the graduated circle of the instrument , by means of which subdivisions of the circle graduation can be read . There are many varieties of the ver- nier ...
... VERNIER . 1. The vernier in the transit is a short graduated arc , movable around the graduated circle of the instrument , by means of which subdivisions of the circle graduation can be read . There are many varieties of the ver- nier ...
Página 43
... vernier , together with a part of the graduated circle . vernier is a double one , for con- venience in reading angles right or left . It will be observed that a space , equal to twenty - nine half degrees on the limb , is laid off from ...
... vernier , together with a part of the graduated circle . vernier is a double one , for con- venience in reading angles right or left . It will be observed that a space , equal to twenty - nine half degrees on the limb , is laid off from ...
Página 44
... vernier to the angle already ascertained within half a degree from the limb : the sum will be the angle sought . The vernier in the figure reads 1 ° 20 ′ L. 5. In some respects a vernier graduated decimally would be more convenient on ...
... vernier to the angle already ascertained within half a degree from the limb : the sum will be the angle sought . The vernier in the figure reads 1 ° 20 ′ L. 5. In some respects a vernier graduated decimally would be more convenient on ...
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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