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 11
... angle is measured by the arc of a circle included between its sides ; the centre of the circle being at the vertex ... tangent of an angle is a right line which touches the enclosing arc at one extremity , and is limited by a right line drawn ...
... angle is measured by the arc of a circle included between its sides ; the centre of the circle being at the vertex ... tangent of an angle is a right line which touches the enclosing arc at one extremity , and is limited by a right line drawn ...
Página 13
... angle is greater than 45 ° , look for the degrees at the bottom of the page , and for the minutes in the right ... tangent , and subtract it therefrom for the cosine or cotangent . Example . Operation . Log . sine 40 ° 26 ' Tabular Find ...
... angle is greater than 45 ° , look for the degrees at the bottom of the page , and for the minutes in the right ... tangent , and subtract it therefrom for the cosine or cotangent . Example . Operation . Log . sine 40 ° 26 ' Tabular Find ...
Página 15
... angle opposite to the latter . 3. In any plane triangle , as the sum of the sides about the vertical angle is to their difference , so is the tangent of half the sum of the angles at the base to the tangent of half their difference . 4 ...
... angle opposite to the latter . 3. In any plane triangle , as the sum of the sides about the vertical angle is to their difference , so is the tangent of half the sum of the angles at the base to the tangent of half their difference . 4 ...
Página 17
... angle from 180 ° ; the remainder will be the sum of the other two angles . Then , by proposition 3 , - As the sum of the given sides is to their difference , So is the tangent of half the sum of the remaining angles to the tangent of ...
... angle from 180 ° ; the remainder will be the sum of the other two angles . Then , by proposition 3 , - As the sum of the given sides is to their difference , So is the tangent of half the sum of the remaining angles to the tangent of ...
Página 50
... Tangents drawn to a circle from the same point are equal . Thus , IBI E. 3. The angle DIE , at the intersection of tangents , is equal to the central angle BC E , included between radii to the tan- gent points . 4. If a chord BE connect the ...
... Tangents drawn to a circle from the same point are equal . Thus , IBI E. 3. The angle DIE , at the intersection of tangents , is equal to the central angle BC E , included between radii to the tan- gent points . 4. If a chord BE connect 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