A 1/16in. scale model of the Pollit and Wigzell Three Rod Tandem Compound Corliss Valve engine originally installed at Washpit Mill, Holmfirth 1909, built from works drawings and photographs to exhibition standard by P.J.M. Southworth with blued steel clad cylinders 1¼in. and 2in. bores x 3in. stroke, three piston rods, slipper type crosshead guide, barrelled connecting rod, studded stuffing boxes, waisted crank, three valve eccentrics, multi-rope driven Whitehead governor and linkage, Pollit and Wigzell patent trip gear, Corliss valves, air pump direct coupled to L.P. piston rod tail shaft and condenser, pipework and valve. The flywheel, correctly built up in eight segments from a separate hub straked to the crankshaft with wood cladding over the spokes and eighteen rope grooves gear ring and small bore barring engine with separate steam supply and automatically disengaging pinion. Further details include hand rails, drip trays and splash guard, dummy lubricators, pipes and cylinder head pressure relief valves, finished in black, green and polished brightwork and mounted on a simulated tile floor with perspex dust cover -- 12./34 x 35½in.(32.5 x 90.2cm.) The prototype of this model was erected in 1909 and ran until 1980 driving through eighteen cotton ropes 1¾in. dia (a short length is included with the model) the weaving shed and a generator, producing 700 hp at 85 rpm. The design patent for this type of engine was granted to Pollit & Wigzell in 1870 principally for use in marine installations. The firm went out of business in 1930 - the engine is still installed in Washpit Mill but lacks a suitable boiler.