[np: 1846?]. , 32, 23 pp. Stitched in original printed front wrapper [spine and extremity wear]. Inscribed, "To Professor Walter R. Johnson with the respects of John S. Gilbert, who requests the favor of a perusal." The text is preceded by three sketches: Transverse Section of Dock and Ship; Perspective View of the Balance Dock; and Balance Dock with Ship-of-the-Line.
Gilbert touts the reliability and superiority of his Balance Dock, its durability and advantages, its mode of construction, with testimonials from experts. These include affidavits and memorials from various ship owners, engineers, commodores [including Charles Stewart]. The final 23 pages repeat the first 23, and have been stitched in, perhaps, to provide an extra for Professor Johnson.
FIRST EDITION. AI 46-2824 . Not in Sabin, Eberstadt, Decker. OCLC locates four copies under several accession numbers as of April 2015. Item #15221