Tracts On Vaults And Bridges. Containing Observations On The Various Forms Of Vaults; On The Taking Down And Rebuilding London Bridge; And On The Principles Of Arches: Illustrated By Extensive Tables Of Bridges. Also Containing The Principles Of Pendent Bridges, With Reference To The Properties Of The Catenary, Applied To The Menai Bridge. And A Theoretical Investigation Of The Catenary PDF Download