A treatise on building in water: in two parts. [electronic resource] : Part I. Particularly relative to the repair and rebuilding of Essex-Bridge, Dublin; and bridge-building in general; with plans properly suited to the re-building of Ormond-Bridge. Part II. Concerning an attempt to contrive and introduce quick and cheap methods for erecting substantial stone buildings and other works, in fresh and salt water, quaking bogs or morasses, for various purposes; fully laid down, and clearly demonstrated, by twelve practical propositions, but not in any case exceeding ten fathom deep: together with a plan for a spacious and commodious harbour for the downs in England, projecting to twenty feet deep at low water. The second edition. To which is added Part III. Hibernia's free trade; or, a plan for the general improvement of Ireland; peculiarly adapted for improving the commercial and landed interest of Ireland; and briefly demonstrating, that not only Great Britain, but the whole British Empire, may gain proportionable advantages thereby. Illustrated with sixty-four copper-plates. By George Semple.