Volume Nine - Pre-Victorian to the present day - even more aspects - Penarth Dock Infrastructure - Building, Repair & Maintenance Aspects . . .
1926 - GWR - Penarth Dock - Renewal of Middle Gates - Elevation and Sections.
Upper image - A sectional view through the Access Truck plus a cross-sectional view at the Central Diaphragm.
Lower image - Notes plus Countersink details for Rivets.
The original poster is held at the archives of the National Museum of Wales. [Museum item number : 88.81I/17] [629] [20180707]