This is a photograph of Hercules Plans for the erection of a superstructure. It shows the elevation that shows the position of trusses before lifting. The weight of lift is 216 tons. Photographs of the Constr More
This is a photograph of Hercules Plans for the erection of a superstructure. It shows the cross section, through the center of the Dry Dock. Photographs of the Construction and Repair of Buildings, Facilities, More