Brindley's reputation spread rapidly and he was soon commissioned to construct more canals. He extended the Bridgewater to Runcorn, connecting it to his next major work, the Trent and Mersey Canal. At this time Brindley had never built a lock and he first built an experimental lock in the grounds of Turnhurst, a house he had bought near the summit, and this determined the design of the narrow canal lock which characterised most of the canals in the Midlands, with a single upper gate and double mitre lower gates. These were for an elongated version of the boats designed for the underground system at Worsley, the so-called 'starvationers', which were subsequently known as narrowboats and this decision was to cast a long shadow on the English canal system.