# The Practical Railway Spiral: With Short Working Formulas and Full Tables of Deflection Angles: Complete Notes of Illustrative Examples

D. Van Nostrand Company, 1913 - 155 halaman

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Halaman 13 - An exterior angle of a triangle is equal to the sum of the two opposite interior angles.
Halaman 83 - NB The minutes in the left-hand column of each page, increasing downwards, belong to the degrees at the top ; and those increasing upwards, in the right.hand column, belong to the degrees below.
Halaman 5 - Heretofore, it has been customary to design spirals with the degree of curvature varying uniformly from zero at the flatter end to the degree of main curve at the sharper end. This idea would be almost correct if there were no flange clearance, if the wheels were loose and if the superelevation were gained at an exactly uniformly varying rate throughout. But, as has been previously stated, none of these ideal conditions actually exist.
Halaman 3 - ... inch. This clearance is necessary for free running, making allowance for irregularities in the gauge, and is required on curves where wider gauge is needed by two or more axles coupled together, as in car trucks and engine driver frames.
Halaman 4 - Upon approaching a curve under . the rigid axles come into play and carry the wheels straight ahead until the opposite flanges strike the outer rail. A shock is then produced which knocks the track out of line and an outward kink is the result.
Halaman 6 - But a spiral of uniformly varying degree, which provides the desired flatness at the beginning, would be of such great length that it would be discarded as impractical.
Halaman 66 - Thus, the characteristic of the logarithm of every integer number, consisting only of one number...
Halaman 6 - ... upon the weight of wheel and load, and the train velocity, and also upon the angle between the rail and the direction of motion at the Tangent -Run-offCurve 0uter Rail 1 Curve Tangent Curve Tangent Inner Rail Fia.
Halaman 5 - In order to eliminate the aforementioned difficulties due to a run-off on straight track, it has been the custom to introduce a curve easement or spiral.