Object StatementTraction engine, 3 speed, sprung, single crank compound, full size, 7 n.h.p., engine No. 2901, metal, made by Charles Burrell & Sons Ltd, St Nicholas Works, Thetford, Norfolk, England, 1907, used by Corio Shire, Victoria, Australia
Physical DescriptionThis Burrell traction engine is a self propelling steam vehicle. It has worm-driven chain steering operated from the driving position at the rear and is fitted with a built-in tender which served as a water tank, fuel bunker and footplate. The fuel was burnt and steam raised in a locomotive-type boiler which consists of a firebox containing an inner firebox, a round boiler barrel containing fire tubes and a smoke box.
This engine is a three-speed type with a single crank compound cylinder arrangement. The single crank compound was patented by Frederick Burrell (patent No. 3489, 1889), and combined simplicity and economy by linking the piston rods onto a common crosshead. This meant that only one connecting rod, crank throw and valve set were required. The engine also has a double-geared final drive, also patented by Burrell (No. 2881, 1878). In this system the spur gear drive to the back wheel was duplicated so that each wheel was driven independently, halving the stress in the most highly-loaded part of the gear train. The compensating gear, or differential normally on the axle, was placed on the second shaft away from road dirt and stones. The higher rotating speed of the second shaft resulted in reduced torque, allowing the assembly to be built much smaller and enclosed to allow for thorough lubrication.
Engine No: 2901, 7 n.h.p.
Made to order: No. 4550
Sent away to order: No. 2523
Cylinders: single crank compound
Bore: 10 inches & 6 inches
Stroke: 12 inches
Steam pressure: 160 p.s.i.
Driving wheels: 7 ft diameter, 24 inch width
Leading wheels: 4 ft 7½ inches diameter
Total weight: 14 tons