Dr. Grant's System of Railing Spiral Stairs: This Hitherto Unsolved Problem Solved; The Solution Is Exceedingly Simple (Classic Reprint) - Softcover

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Excerpt from Dr. Grant's System of Railing Spiral Stairs: This Hitherto Unsolved Problem Solved; The Solution Is Exceedingly Simple

Any stair, or that part of it at least, which climbs a column, circular or elliptic, will be termed spiral, whether it climbs regularly or irregularly.

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