Object StatementSteam engine, single cylinder portable, 'Britannia', metal / paint, made by Marshall Sons & Co Ltd, Gainsborough, England, 1914
Physical DescriptionThe engine's horizontal cylinder, containing the piston, sits on top of a much larger cylindrical body which is mounted on four road wheels. The piston is connected to an elevated flywheel which serves also as the drive wheel; a belt can be wound around its rim and connected to the equipment it is required to drive. The body is made up of: a cylindrical firebox with log-burning grate, where fuel is burnt; in front of that a fire-tube boiler where water is converted to steam; and in front of that a smoke-box surmounted by a tall stack that carries smoke away, creating a draught of air through the firebox that ensures efficient combustion. Three doors provide access: on the back of the firebox, for introducing fuel; on the side of the firebox, for emptying the ash pan; and on the front of the smoke-box, for cleaning and maintenance. A drawbar mounted between the front wheels allows the engine to be hauled from place to place, and the stack can be folded back at its base to prepare the engine for transit or storage.
The engine is painted in green, black and red, with yellow and red hoops around the green boiler and firebox, and white detail on the red wheels. A manufacturer's transfer is affixed to the boiler. It depicts Britannia as a warrior with trident, shield and seated lion; she is standing on a toothed wheel and is surrounded by exhibition medals.
The engine, number 65311, has 150 mm (6 inch) bore and 250 mm (10 inch) stroke. It is fitted with a slide valve, a mechanical oiler and a Pickering governor. It operated at 830 kPa (120 psi) and had nominal output of 3 kW (4 horsepower). The boiler has two safety valves and was supplied with water by a feed pump powered via an eccentric on the crankshaft. Inside their riveted sheet-metal exterior, the boiler and firebox are lagged with closely laid long timber strips nailed onto widely spaced timber hoops.
MarksOn cylinder cover: Marshall Sons & Co Ltd, engine number 65311
On front axle: 65311
On a plate on the smoke-box: Britannia engine, made expressly to the order of, RL Scrutton and Co Ltd, 161 Clarence St, Sydney.
On front of the fore-carriage: 4LB (meaning 4 nhp log-burner)
On transfer: Marshall, Sons & Co Limited Gainsboro' England, Britannia Iron Works.