Boat lift

The lift operated between 1789 and 1868,[1] and for a period of time after its opening engineer James Green reporting that five had been built between 1796 and 1830.

[2] The idea of a boat lift for canals can be traced back to a design based on balanced water-filled caissons in Erasmus Darwin's Commonplace Book (pp.

58–59) dated 1777–1778[3] In 1796 an experimental balance lock was designed by James Fussell and constructed at Mells on the Dorset and Somerset Canal, though this project was never completed.

In 1904 the Peterborough Lift Lock designed by Richard Birdsall Rogers opened in Canada.

This 19.8-metre (65 ft) high lift system is operated by gravity alone, with the upper bay of the two bay system loaded with an additional 30 cm (12 in) of water as to give it greater weight.