Transoftioiis Society N<nvl Archil icts and Murine liiiginccrs, I'ol. 3j. 1019. 



Plate 12. 



To illustrate i^apcr on "Methods F.iiiploycd in the Construction of Concrete Shifts." 



by R. J. Pf'/V/, Esq., Visitor. 



NORRIS PETERS. INC., LITHO.. WASHINGTON, D. C. 



