Engineering
There were originally twelve locks in the Tinsley flight, which rises 70 feet (21 m) but in order to accommodate a new railway bridge, locks 7 and 8 were combined in 1959, with a single concrete chamber replacing both of them. The modern numbering scheme has locks 1 to 6, 7/8 and 9 to 12. Water for the top pound, and hence the locks, is pumped from a small building situated below Tinsley Viaduct. This originally housed a steam engine to drive the pumps, but this was replaced by a duty and standby 125 hp diesel engine in 1918. The pumps supply 3,500 gallons per minute (265 l/s) to an outlet near the top lock of the flight.
Read more about this topic: Sheffield Canal
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