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balancelock

The best preserved caisson site on the Great Western Canal is at Nynehead (with a drop of 24 feet). It appears similar to the above

See: http://www.hows.org.uk/personal/rail/misc/gwc.htm

There's an excellent animation at: http://nynehead.org/canal/lift_animation.html, (Warning...loud noise at the start!)

Fussell's invention is an interesting
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