Three sectional views of the fire plug showing an external view and views in the open and shut position at the "Ordinary Level of Pavement." Below is an explanation of the diagram signed Frederic Graff, Superintendent of Fairmount Waterworks, dated January 15, 1854. Explanation contains instructions on how to close and open the plug and mentions handling procedures for firemen. Procedures include "The Firemen are respectfully requested to screw the plug hard shut when they have finished using it that there may be no leakage through the valve D" and if frozen, "For the purpose of freeing this the firemen are recommended to carry in their lockers during winter a strong wench with a handle two and one half feet long.", Not in Wainwright., Key to parts of the plug printed below the image: A. is the Screw handle. B." " Frost rod. C. " " Frost pipe or waste. D. " " Plug valve. E. " " Valve rod. F. " " Plug case outside. G. " " Plug nut., Philadelphia on Stone, POSP 207
Creator
Rease & Schell, artist
Date
[1854]
Location
Library Company of Philadelphia | Print Department **BW - Machinery [P.8970.19]