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Keywords: Sickergill Skew Bridge Under Construction.jpg en Sickergill Skew Bridge over the River Raven at Renwick near Penrith under construction showing the helicoidal coursing of the stones Original plate from 'A Practical Treatise on Segmental and Elliptical Oblique or Skew Arches' George Joseph Bell book author photographer not named ca 1898 Arch bridges Skew arch bridges Victorian architecture Black and white photographs PD-old |