The Devonport leat was constructed in the 1790s to carry water from Dartmoor to the expanding dockyards at Devonport. It is fed by the West Dart, Blackabrook, and the Cowsic rivers. It now terminates at Burrator reservoir[?].
... be accelerated to a smaller extent by the slipping friction.
The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US ...