A treatise on building in water. [electronic resource] : In two parts. Part I. Particularly relative to the repair and re-building 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 a commodious Harbour for the Downs in England, projecting to 20 Feet deep at low Water. Principally addressed and peculiarly adapted to young and unexperienced Readers. Illustrated with sixty-three copper-plates. By George Semple.