This section is from the book "A Treatise On Architecture And Building Construction Vol3: Stair Building, Ornamental Ironwork, Roofing, Sheet-Metal Work, Electric-Light Wiring And Bellwork", by The Colliery Engineer Co.. Also available from Amazon: A Treatise On Architecture And Building Construction.
Fig. 48 differs from the preceding plan only in the form of its cylinder, which is semicircular in plan, and, while requiring a little more run, furnishes a more pleasing rail and cylinder.
Fig. 48.
 
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