THE JAMES SIMPSON, OR WADDON, ENGINE

The Waddon Pumping Station at Croydon, Surrey, had the distinction of being the last waterworks in Britain to have a reciprocating steam engine in commercial operation. Its two pumping engines were finally shut down in 1983. The older engine (No.1) was presented to the museum by Thames Water and was dismantled and moved to Kew Bridge in 1984.

Date of manufacture 1910
Cylinder Diameter 21 & 42 inches (533 & 1067 mm)
Stroke 36 inches (914 mm)
Flywheel Diameters 16 feet (4.8 meters)
Water output per minute 2080 Gallons (9464 litres)
Water output per 24 hours 3 M Gallons (13.6 M litres)
Power Rating 180 horse power at 30 r.p.m
Last worked 1983
Returned to steam 1990

The Waddon engine was built by James Simpson & Company in Pimlico in 1910 and so is our joint youngest engine, sharing the title with the Triple. It is a cross-compound engine, the high and low pressure cylinders being placed horizontally, with the flywheel between them. They are connected by a receiver, which can be seen above the two cylinders.

This engine drives two sets of pumps - dual bucket pumps, or well pumps, which are driven from a tail rod connected to the low pressure cylinder's piston rod, via a bell crank; and a force pump which is driven from a tail rod connected to the high pressure cylinder's piston rod.