The Largest Floating Dock in the World. On the morning of August 22nd the huge floating dock which is to constitute such a valuable addition to the docking accommodation of warshi at Portsmouth was towed into Portsmouth Harbour by 4 powerful tugs. The dock left Birkenhead a week previously where it had been constructed by Messrs. Cammell Laird & Co., and arrived after a very rough voyage. The dock was ordered in 1909 and is the largest in the world. Its length over all is 700 feet and 680 feet over the blocks. Its width at the entrance is 150 feet and it has a lifting capacity of 4,000 tons,so that it will be able to dock the largest Super-Dreadnought yet built or designed. This photo shows the huge dock being towed into Portsmouth Harbour.