 This machine is now in the London Science Museum.In the 1820s Donkin became a director of the Thames Tunnel Company, having become acquainted with Marc Brunel when he had supplied equipment for his machinery at Chatham Dockyard.In 1825–27 Donkin supplied pumps for removing water from the tunnel and also workmen for modifying the tunnelling shield; at one time it was even suggested that he replace Brunel as engineer.