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. 50 is a plan of a quarter-platform stairway with a 15-inch cylinder having a regular step at its center.
Fig. 50.
 
Continue to: