A Practical Treatise on Railway Curves and Location, for Young Engineers ...

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H.C. Baird & Company, 1890 - 100 páginas
 

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Página 50 - From the square of the radius, subtract the square of half the chord; and take the square root of the remainder from the radius, for the middle ordinate.
Página 7 - It is found that the circle described with radius of 5730 feet has a circumference of 36,000 feet. Since there are 360° in the circle, the central angle subtended by a chord of 100 feet is, in this case, equal to 1°, and the curve is named a one degree curve. So likewise in a circle with radius of 2865 feet, half of 5730, the central angle corresponding to the chord 100 is 2° ; the curve is then called a two degree curve. The beginning of a curve is called the point of curvature, or simply the...
Página 53 - To find the deflexion distance with chord of 100 feet and any radius. — Divide the constant number 10000 by the radius in feet ; the quotient will be the deflexion distance : — for the deflexion distance with a radius of 10000 feet is 1 foot, and the deflexion distances for other radii increase inversely as the radii. Example. — What is the deflexion distance for a 5° curve, the chord being 100 feet ? Here ^^ = 8-72 feet, the deflexion distance. To find the deflexion distance with any given...

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