To find the Radius for a curved rail:
Step 1: Starting at the last post in the straight run (point A), lay
cloth tape along the path that the curved guide rail will follow.
Step 2: Mark-off two points along the curved cloth tape: one at 6'-3", (point B) and the second at 12'-6" (point C).
Step 3: Pull string directly from starting point (point A) to the second mark-off point (point C).
Step 4: Measure from the first marked-off point (point B) over to the mid-point of the taut string. this measurement (D) is the rise or "middle ordinate."
Step 5: Check the chart to find the Radius (R), given the Rise (D).
Example: a Rise of 3 7/8" inches would result in a Radius of 60 feet.
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