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Updated: June 25, 2025
The wing flight was a convenient arrangement for double houses, as instanced by the old Billmeyer house in Germantown, with its exceedingly plain iron handrail and straight spindles. Of more interest is the balustrade at Number 207 La Grange Alley with its evolute spiral band and slender ball spindles beneath.
Thus the wave KE, while advancing toward the meeting place becomes abc, whereof the part ab is made by the evolute bC, a portion of the curve ENC, while the end C remains attached; and the part bc by the evolute of the portion bE while the end E remains attached.
And the surface EK which all those waves will touch, will be the continuation of the wave AD in the sphere at the moment when the piece D has reached E. Now the line EK is not an arc of a circle, but is a curved line formed as the evolute of another curve ENC, which touches all the rays HL, GM, FO, etc., that are the refractions of the parallel rays, if we imagine laid over the convexity ENC a thread which in unwinding describes at its end E the said curve EK. For, supposing that this curve has been thus described, we will show that the said waves formed from the centres F, G, H, etc., will all touch it.
The principal charm of the South Seventh Street rail lies in its extreme simplicity, the twisted section of the spindles near the bottom being a clever expedient. The pleasing effect of the design at Seventh and Locust streets is largely due to appropriate use of the evolute spiral band. Only a little more ornate than the South Seventh Street stair rail is that in South Fourth Street.
There is a rigid fixity written over the face of nature. Every law and principle is complete and perfect and finished, and there is no room for evolution. Matter did not create itself, nor evolute nor grow. It must have been created instantaneously by the power of God, whether in a nebulous condition or not.
Rich in effect, yet essentially simple in design, it has grace in every line, is not too ornate and displays splendid workmanship. Again a spiral design is conspicuous in the stair balustrades, and the curved newel treatment recalls that of the foregoing stoop. The balustrade of the platform consists of a simple diaper pattern of intersecting arcs with the familiar evolute band above and below.
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