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Keywords: Plate from Nicholson-II.png en A plate from Peter Nicholson's book The Guide to Railway Masonry containing a Complete Treatise on the Oblique Arch showing the development of the intrados of a helicoidal skew arch against its plan view Plate from Peter Nicholson's book The Guide to Railway Masonry containing a Complete Treatise on the Oblique Arch Peter Nicholson 1860 PD-old Line drawings Construction drawings |