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On isoptic families of curves
Published online by Cambridge University Press: 31 October 2008
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1. Imagine that a number of straight lines, coplanar and concurrent, are united so as to form as it were a rigid frame. Imagine that this frame is moved (continuously) in the plane in such a way that two selected lines always touch two cycloids traced in the plane. Then it will be found that
Every line of the frame will move so as to envelope a cycloid.
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- Copyright © Edinburgh Mathematical Society 1947
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